RESIDUE 3MC 17 CONECT N3 3 CN3 C2 C4 CONECT CN3 4 N3 H31 H32 H33 CONECT N1 3 C2 C6 HN1 CONECT C2 3 N3 N1 O2 CONECT O2 1 C2 CONECT C4 3 N3 N4 C5 CONECT N4 3 C4 HN41 HN42 CONECT C5 3 C4 C6 H5 CONECT C6 3 N1 C5 H6 CONECT H31 1 CN3 CONECT H32 1 CN3 CONECT H33 1 CN3 CONECT HN1 1 N1 CONECT HN41 1 N4 CONECT HN42 1 N4 CONECT H5 1 C5 CONECT H6 1 C6 END HET 3MC 17 HETNAM 3MC 3-METHYLCYTOSINE FORMUL 3MC C5 H8 N3 O1 1+