RESIDUE 4SX 18 CONECT O11 1 S9 CONECT S9 4 O11 O12 O10 C4 CONECT O12 1 S9 CONECT O10 2 S9 H6 CONECT C4 3 S9 C3 C5 CONECT C3 3 C4 C2 H1 CONECT C5 3 C4 C6 H2 CONECT C6 3 C5 C1 H3 CONECT C1 3 C6 O7 C2 CONECT O7 2 C1 H4 CONECT C2 3 C3 C1 O8 CONECT O8 2 C2 H5 CONECT H1 1 C3 CONECT H2 1 C5 CONECT H3 1 C6 CONECT H4 1 O7 CONECT H5 1 O8 CONECT H6 1 O10 END HET 4SX 18 HETNAM 4SX 3,4-dihydroxybenzenesulfonic acid FORMUL 4SX C6 H6 O5 S1