#name	short_name	originating_base	rnamods_abbrev
1,2′-O-dimethyladenosine	m1Am	A	œ
1,2′-O-dimethylguanosine	m1Gm	G	ε
1,2′-O-dimethylinosine	m1Im	A	ξ
1-methyl-3-(3-amino-3-carboxypropyl)pseudouridine	m1acp3Y	U	α
1-methyladenosine	m1A	A	"
1-methylguanosine	m1G	G	K
1-methylinosine	m1I	A	O
1-methylpseudouridine	m1Y	U	]
2,8-dimethyladenosine	m2,8A	A	±
2-geranylthiouridine	ges2U	U	Γ
2-lysidine	k2C	C	}
2-methyladenosine	m2A	A	/
2-methylthio cyclic N6-threonylcarbamoyladenosine	ms2ct6A	A	ÿ
2-methylthio-N6-(cis-hydroxyisopentenyl) adenosine	ms2io6A	A	≠
2-methylthio-N6-hydroxynorvalylcarbamoyladenosine	ms2hn6A	A	≈
2-methylthio-N6-isopentenyladenosine	ms2i6A	A	*
2-methylthio-N6-methyladenosine	ms2m6A	A	∞
2-methylthio-N6-threonylcarbamoyladenosine	ms2t6A	A	[
2-selenouridine	se2U	U	ω
2-thio-2′-O-methyluridine	s2Um	U	∏
2-thiocytidine	s2C	C	%
2-thiouridine	s2U	U	2
2′-O-methyladenosine	Am	A	:
2′-O-methylcytidine	Cm	C	B
2′-O-methylguanosine	Gm	G	#
2′-O-methylinosine	Im	A	≤
2′-O-methylpseudouridine	Ym	U	Z
2′-O-methyluridine	Um	U	J
2′-O-methyluridine 5-oxyacetic acid methyl ester		0503U	U
2′-O-ribosyladenosine (phosphate)	Ar(p)	A	^
2′-O-ribosylguanosine (phosphate)	Gr(p)	G	ℑ
2′3′-cyclic phosphate end	(pN)2′3′>p	pppN	
3,2′-O-dimethyluridine	m3Um	U	σ
3-(3-amino-3-carboxypropyl)-5,6-dihydrouridine	acp3D	U	Ð
3-(3-amino-3-carboxypropyl)pseudouridine	acp3Y	U	Þ
3-(3-amino-3-carboxypropyl)uridine	acp3U	U	X
3-methylcytidine	m3C	C	'
3-methylpseudouridine	m3Y	U	κ
3-methyluridine	m3U	U	δ
4-demethylwyosine	imG-14	G	†
4-thiouridine	s4U	U	4
5,2′-O-dimethylcytidine	m5Cm	C	τ
5,2′-O-dimethyluridine	m5Um	U	\
5-(carboxyhydroxymethyl)-2′-O-methyluridine methyl ester	mchm5Um	U	b
5-(carboxyhydroxymethyl)uridine methyl ester	mchm5U	U	,
5-(isopentenylaminomethyl)-2-thiouridine	inm5s2U	U	½
5-(isopentenylaminomethyl)-2′-O-methyluridine	inm5Um	U	¼
5-(isopentenylaminomethyl)uridine	inm5U	U	¾
5-aminomethyl-2-geranylthiouridine	nm5ges2U	U	Δ
5-aminomethyl-2-selenouridine	nm5se2U	U	π
5-aminomethyl-2-thiouridine	nm5s2U	U	∫
5-aminomethyluridine	nm5U	U	∪
5-carbamoylhydroxymethyluridine	nchm5U	U	r
5-carbamoylmethyl-2-thiouridine	ncm5s2U	U	l
5-carbamoylmethyl-2′-O-methyluridine	ncm5Um	U	~
5-carbamoylmethyluridine	ncm5U	U	&
5-carboxyhydroxymethyluridine	chm5U	U	≥
5-carboxymethyl-2-thiouridine	cm5s2U	U	℘
5-carboxymethylaminomethyl-2-geranylthiouridine	cmnm5ges2U	U	f
5-carboxymethylaminomethyl-2-selenouridine	cmnm5se2U	U	⊥
5-carboxymethylaminomethyl-2-thiouridine	cmnm5s2U	U	$
5-carboxymethylaminomethyl-2′-O-methyluridine	cmnm5Um	U	)
5-carboxymethylaminomethyluridine	cmnm5U	U	!
5-carboxymethyluridine	cm5U	U	◊
5-cyanomethyluridine	cnm5U	U	Ѷ
5-formyl-2′-O-methylcytidine	f5Cm	C	°
5-formylcytidine	f5C	C	>
5-hydroxycytidine	ho5C	C	Ç
5-hydroxymethylcytidine	hm5C	C	∅
5-hydroxyuridine	ho5U	U	∝
5-methoxycarbonylmethyl-2-thiouridine	mcm5s2U	U	3
5-methoxycarbonylmethyl-2′-O-methyluridine	mcm5Um	U	∩
5-methoxycarbonylmethyluridine	mcm5U	U	1
5-methoxyuridine	mo5U	U	5
5-methyl-2-thiouridine	m5s2U	U	F
5-methylaminomethyl-2-geranylthiouridine	mnm5ges2U	U	h
5-methylaminomethyl-2-selenouridine	mnm5se2U	U	≅
5-methylaminomethyl-2-thiouridine	mnm5s2U	U	S
5-methylaminomethyluridine	mnm5U	U	{
5-methylcytidine	m5C	C	?
5-methyldihydrouridine	m5D	U	ρ
5-methyluridine	m5U	U	T
5-taurinomethyl-2-thiouridine	tm5s2U	U	∃
5-taurinomethyluridine	tm5U	U	Ê
5′ (3′ -dephospho-CoA)	CoA(pN)	pppN	♠
5′ (3′ -dephosphoacetyl-CoA)	acCoA(pN)	pppN	♣
5′ (3′ -dephosphomalonyl-CoA)	malonyl-CoA(pN)	pppN	♥
5′ (3′ -dephosphosuccinyl-CoA)	succinyl-CoA(pN)	pppN	♦
5′ diphosphate end	p(pN)	pppN	ϒ
5′ hydroxyl end	5′-OH-N	pppN	
5′ monophosphate end	(pN)	pppN	m
5′ nicotinamide adenine dinucleotide	NAD(pN)	pppN	Ξ
5′ triphosphate end	pp(pN)	pppN	ϖ
7-aminocarboxypropyl-demethylwyosine	yW-86	G	¥
7-aminocarboxypropylwyosine	yW-72	G	Ω
7-aminocarboxypropylwyosine methyl ester	yW-58	G	⇑
7-aminomethyl-7-deazaguanosine	preQ1tRNA	preQ0base	∉
7-cyano-7-deazaguanosine	preQ0tRNA	preQ0base	φ
7-methylguanosine	m7G	G	7
7-methylguanosine cap (cap 0)	m7Gpp(pN)	pppN	©
8-methyladenosine	m8A	A	â
N2,2′-O-dimethylguanosine	m2Gm	G	γ
N2,7,2′-O-trimethylguanosine	m2,7Gm	G	æ
N2,7-dimethylguanosine	m2,7G	G	∨
N2,7-dimethylguanosine cap (cap DMG)	m2,7Gpp(pN)	pppN	®
N2,N2,2′-O-trimethylguanosine	m2,2Gm	G	|
N2,N2,7-trimethylguanosine	m2,2,7G	G	∠
N2,N2,7-trimethylguanosine cap (cap TMG)	m2,2,7Gpp(pN)	pppN	¶
N2,N2-dimethylguanosine	m2,2G	G	R
N2-methylguanosine	m2G	G	L
N4,2′-O-dimethylcytidine	m4Cm	C	λ
N4,N4,2′-O-trimethylcytidine	m4,4Cm	C	β
N4,N4-dimethylcytidine	m4,4C	C	μ
N4-acetyl-2′-O-methylcytidine	ac4Cm	C	ℵ
N4-acetylcytidine	ac4C	C	M
N4-methylcytidine	m4C	C	ν
N6,2′-O-dimethyladenosine	m6Am	A	χ
N6,N6,2′-O-trimethyladenosine	m6,6Am	A	η
N6,N6-dimethyladenosine	m6,6A	A	ζ
N6-(cis-hydroxyisopentenyl)adenosine	io6A	A	`
N6-acetyladenosine	ac6A	A	⇓
N6-formyladenosine	f6A	A	Ϩ
N6-glycinylcarbamoyladenosine	g6A	A	≡
N6-hydroxymethyladenosine	hm6A	A	Ϫ
N6-hydroxynorvalylcarbamoyladenosine	hn6A	A	√
N6-isopentenyladenosine	i6A	A	+
N6-methyl-N6-threonylcarbamoyladenosine	m6t6A	A	E
N6-methyladenosine	m6A	A	=
N6-threonylcarbamoyladenosine	t6A	A	6
Qbase	Qbase	preQ0base	∴
adenosine	A	A	A
agmatidine	C+	C	¿
alpha-dimethylmonophosphate cap	mm(pN)	pppN	
alpha-methylmonophosphate cap	m(pN)	pppN	
archaeosine	G+	preQ0base	(
cyclic N6-threonylcarbamoyladenosine	ct6A	A	e
cytidine	C	C	C
dihydrouridine	D	U	D
epoxyqueuosine	oQtRNA	preQ0base	ς
galactosyl-queuosine	galQtRNA	preQ0base	9
gamma-methyltriphosphate cap	mpp(pN)	pppN	§
glutamyl-queuosine	gluQtRNA	preQ0base	⊄
guanosine	G	G	G
guanosine added to any nucleotide	pG(pN)	pppN	none
guanylylated 5′ end (cap G)	Gpp(pN)	pppN	ϑ
hydroxy-N6-threonylcarbamoyladenosine	ht6A	A	«
hydroxywybutosine	OHyW	G	⊆
inosine	I	A	I
isowyosine	imG2	G	⊇
mannosyl-queuosine	manQtRNA	preQ0base	8
methylated undermodified hydroxywybutosine	OHyWy	G	y
methylwyosine	mimG	G	∑
peroxywybutosine	o2yW	G	W
preQ0base	preQ0base	preQ0base	ψ
preQ1base	preQ1base	preQ0base	∇
pseudouridine	Y	U	P
queuosine	QtRNA	preQ0base	Q
undermodified hydroxywybutosine	OHyWx	G	š
unknown methylated base	Xm		Î
unknown modification	xX		@
unknown modified adenosine	xA	A	H
unknown modified cytidine	xC	C	<
unknown modified guanosine	xG	G	;
unknown modified uridine	xU	U	N
unknown nucleotide residue	N		.
uridine	U	U	U
uridine 5-oxyacetic acid	cmo5U	U	V
uridine 5-oxyacetic acid methyl ester	mcmo5U	U	υ
wybutosine	yW	G	Y
wyosine	imG	G	€
