RESIDUE 8TX 16 CONECT N1 3 C2 C6 HN1 CONECT C2 3 N1 O2 N3 CONECT O2 1 C2 CONECT N3 3 C2 C4 HN3 CONECT C4 3 N3 C5 N9 CONECT C5 3 C4 C6 N7 CONECT C6 3 N1 C5 O6 CONECT O6 1 C6 CONECT N7 3 C5 C8 HN7 CONECT C8 3 N7 S8 N9 CONECT S8 1 C8 CONECT N9 3 C4 C8 HN9 CONECT HN1 1 N1 CONECT HN3 1 N3 CONECT HN7 1 N7 CONECT HN9 1 N9 END HET 8TX 16 HETNAM 8TX 8-thioxo-3,7,8,9-tetrahydro-1H-purine-2,6-dione FORMUL 8TX C5 H4 N4 O2 S1