RESIDUE 03Y 17 CONECT CB 4 CA SG HB2 HB3 CONECT C 3 CA O OXT CONECT CA 4 CB C CM N CONECT CM 4 CA H21 H21A H21B CONECT N 3 CA H H2 CONECT O 1 C CONECT SG 2 CB HG CONECT HB2 1 CB CONECT HB3 1 CB CONECT H21 1 CM CONECT H21A 1 CM CONECT H21B 1 CM CONECT H 1 N CONECT H2 1 N CONECT HG 1 SG CONECT OXT 2 C HXT CONECT HXT 1 OXT END HET 03Y 17 HETNAM 03Y 2-methyl-L-cysteine FORMUL 03Y C4 H9 N1 O2 S1