RESIDUE 2ON 15 CONECT C6 3 N1 C5 O6 CONECT N1 3 C6 C2 HN1 CONECT C2 3 N1 N3 S2 CONECT N3 2 C2 C4 CONECT C4 3 N3 C5 N9 CONECT C5 3 C6 C4 N7 CONECT N9 3 C4 C8 HN9 CONECT C8 3 N9 N7 HC8 CONECT N7 2 C5 C8 CONECT O6 1 C6 CONECT S2 2 C2 HS2 CONECT HN1 1 N1 CONECT HS2 1 S2 CONECT HC8 1 C8 CONECT HN9 1 N9 END HET 2ON 15 HETNAM 2ON 2-sulfanyl-1,9-dihydro-6H-purin-6-one FORMUL 2ON C5 H4 N4 O1 S1