RESIDUE 05N 21 CONECT N 3 CA C52 H CONECT CA 4 N C20 C HA CONECT C20 4 CA C21 C53 H16 CONECT C21 4 C20 O9 C52 H17 CONECT C 3 CA OXT O CONECT O9 2 C21 H40 CONECT C52 4 N C21 H41 H42 CONECT C53 4 C20 H43 H44 H45 CONECT HA 1 CA CONECT H16 1 C20 CONECT H17 1 C21 CONECT H40 1 O9 CONECT H41 1 C52 CONECT H42 1 C52 CONECT H43 1 C53 CONECT H44 1 C53 CONECT H45 1 C53 CONECT H 1 N CONECT OXT 2 C HXT CONECT O 1 C CONECT HXT 1 OXT END HET 05N 21 HETNAM 05N (3R,4R)-4-hydroxy-3-methyl-L-proline FORMUL 05N C6 H11 N O3