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 Administrative Instructions under the Patent Cooperation Treaty 

Annex C, Appendix 2

Nucleotide and Amino Acid Symbols and Feature Table

Table 2:  List of Modified Nucleotides

Symbol Meaning
ac4c 4-acetylcytidine
chm5u 5-(carboxyhydroxymethyl)uridine
cm 2’-O-methylcytidine
cmnm5s2u 5-carboxymethylaminomethyl-2-thiouridine
cmnm5u 5-carboxymethylaminomethyluridine
d dihydrouridine
fm 2’-O-methylpseudouridine
gal q beta, D-galactosylqueuosine
gm 2’-O-methylguanosine
i inosine
i6a N6-isopentenyladenosine
m1a 1-methyladenosine
m1f 1-methylpseudouridine
m1g 1-methylguanosine
m1i 1-methylinosine
m22g 2,2-dimethylguanosine
m2a 2-methyladenosine
m2g< 2-methylguanosine
m3c 3-methylcytidine
m5c 5-methylcytidine
m6a N6-methyladenosine
m7g 7-methylguanosine
mam5u 5-methylaminomethyluridine
mam5s2u 5-methoxyaminomethyl-2-thiouridine
man q beta, D-mannosylqueuosine
mcm5s2u 5-methoxycarbonylmethyl-2-thiouridine
mcm5u 5-methoxycarbonylmethyluridine
mo5u 5-methoxyuridine
ms2i6a 2-methylthio-N6-isopentenyladenosine
ms2t6a N-((9-beta-D-ribofuranosyl-2-methylthiopurine-6-yl)carbamoyl)threonine
mt6a N-((9-beta-D-ribofuranosylpurine-6-yl)N-methylcarbamoyl)threonine
mv uridine-5-oxyacetic acid-methylester
o5u uridine-5-oxyacetic acid
osyw wybutoxosine
p pseudouridine
q queuosine
s2c 2-thiocytidine
s2t 5-methyl-2-thiouridine
s2u 2-thiouridine
s4u 4-thiouridine
t 5-methyluridine
t6a N-((9-beta-D-ribofuranosylpurine-6-yl)-carbamoyl)threonine
tm 2’-O-methyl-5-methyluridine
um 2’-O-methyluridine
yw wybutosine
x 3-(3-amino-3-carboxy-propyl)uridine, (acp3)u
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