RESIDUE 5HY 17 CONECT C 3 O CA NAF CONECT N 3 CA CAI HN CONECT O 1 C CONECT CA 4 C N CB HA CONECT CB 4 CA CG HB HBA CONECT CG 3 CB OD1 OD2 CONECT OAB 1 CAI CONECT NAF 3 C CAI HNAF CONECT CAI 3 N OAB NAF CONECT OD1 2 CG HOD1 CONECT OD2 1 CG CONECT HN 1 N CONECT HA 1 CA CONECT HB 1 CB CONECT HBA 1 CB CONECT HNAF 1 NAF CONECT HOD1 1 OD1 END HET 5HY 17 HETSYN 5HY Hydantoin-5-acetic acid HETNAM 5HY [(4R)-2,5-dioxoimidazolidin-4-yl]acetic acid FORMUL 5HY C5 H6 N2 O4