RESIDUE AY9 18 CONECT C1 4 C2 O5 H11C H12C CONECT C2 3 C1 C3 O2 CONECT C3 3 C2 C4 O3 CONECT C4 3 C3 C5 H4 CONECT C5 4 C4 C6 O5 H5 CONECT C6 4 C5 O6 H61C H62C CONECT O2 1 C2 CONECT O3 2 C3 H3 CONECT O5 2 C1 C5 CONECT O6 2 C6 H6 CONECT H11C 1 C1 CONECT H12C 1 C1 CONECT H4 1 C4 CONECT H3 1 O3 CONECT H5 1 C5 CONECT H61C 1 C6 CONECT H62C 1 C6 CONECT H6 1 O6 END HET AY9 18 HETNAM AY9 Ascopyrone M FORMUL AY9 C6 H8 O4