RESIDUE 1HD 21 CONECT C 4 CA O H12 H13 CONECT CD 3 OE1 C1 N1 CONECT N 3 CA H H2 CONECT OE1 1 CD CONECT CA 4 C N CB HA CONECT CB 4 CA N1 H5 H6 CONECT C1 4 CD H7 H8 H9 CONECT N1 3 CD CB H10 CONECT O 2 C H11 CONECT H 1 N CONECT H2 1 N CONECT HA 1 CA CONECT H5 1 CB CONECT H6 1 CB CONECT H7 1 C1 CONECT H8 1 C1 CONECT H9 1 C1 CONECT H10 1 N1 CONECT H11 1 O CONECT H12 1 C CONECT H13 1 C END HET 1HD 21 HETNAM 1HD N-[(2S)-2-amino-3-hydroxypropyl]acetamide FORMUL 1HD C5 H12 N2 O2