RESIDUE 03S 9 CONECT S10 4 O11 O12 C13 OXT CONECT O11 1 S10 CONECT O12 1 S10 CONECT C13 4 S10 H113 H213 H313 CONECT H113 1 C13 CONECT H213 1 C13 CONECT H313 1 C13 CONECT OXT 2 S10 HXT CONECT HXT 1 OXT END HET 03S 9 HETNAM 03S methanesulfonic acid FORMUL 03S C1 H4 O3 S1