RESIDUE 17E 16 CONECT N1 3 C2 C6 H8 CONECT C2 3 N1 O2 N3 CONECT O2 1 C2 CONECT N3 2 C2 C4 CONECT C4 3 N3 N4 C5 CONECT N4 3 C4 H1 H2 CONECT C5 3 C4 C6 CM5 CONECT C6 3 N1 C5 H4 CONECT CM5 4 C5 H5 H6 H7 CONECT H1 1 N4 CONECT H2 1 N4 CONECT H4 1 C6 CONECT H5 1 CM5 CONECT H6 1 CM5 CONECT H7 1 CM5 CONECT H8 1 N1 END HET 17E 16 HETSYN 17E 4-amino-5-methylpyrimidin-2(1H)-one HETNAM 17E 5-methylcytosine FORMUL 17E C5 H7 N3 O1