RESIDUE 1ZT 19 CONECT C 3 O CH3 N CONECT O 1 C CONECT CH3 4 C H1 H2 H3 CONECT N 3 C CA H CONECT CA 4 N C1 CB HA CONECT C1 3 CA O1 OXT CONECT O1 1 C1 CONECT CB 4 CA SG HB2 HB3 CONECT SG 2 CB HG CONECT OXT 2 C1 HXT CONECT H1 1 CH3 CONECT H2 1 CH3 CONECT H3 1 CH3 CONECT H 1 N CONECT HA 1 CA CONECT HB2 1 CB CONECT HB3 1 CB CONECT HG 1 SG CONECT HXT 1 OXT END HET 1ZT 19 HETNAM 1ZT N-acetyl-L-cysteine FORMUL 1ZT C5 H9 N1 O3 S1