RESIDUE 1MC 16 CONECT N3 2 C4 C2 CONECT C4 3 N3 N4 C5 CONECT N1 3 CN1 C2 C6 CONECT CN1 4 N1 H11 H12 H13 CONECT C2 3 N3 N1 O2 CONECT O2 1 C2 CONECT N4 3 C4 HN41 HN42 CONECT C5 3 C4 C6 H5 CONECT C6 3 N1 C5 H6 CONECT H11 1 CN1 CONECT H12 1 CN1 CONECT H13 1 CN1 CONECT HN41 1 N4 CONECT HN42 1 N4 CONECT H5 1 C5 CONECT H6 1 C6 END HET 1MC 16 HETNAM 1MC 1-METHYLCYTOSINE FORMUL 1MC C5 H7 N3 O1