RESIDUE AIB 16 CONECT N 3 CA 1HN 2HN CONECT CA 4 N C CB1 CB2 CONECT C 3 CA O1 O2 CONECT O1 1 C CONECT O2 2 C HO2 CONECT CB1 4 CA 1HB1 2HB1 3HB1 CONECT CB2 4 CA 1HB2 2HB2 3HB2 CONECT 1HN 1 N CONECT 2HN 1 N CONECT HO2 1 O2 CONECT 1HB1 1 CB1 CONECT 2HB1 1 CB1 CONECT 3HB1 1 CB1 CONECT 1HB2 1 CB2 CONECT 2HB2 1 CB2 CONECT 3HB2 1 CB2 END HET AIB 16 HETNAM AIB ALPHA-AMINOISOBUTYRIC ACID FORMUL AIB C4 H9 N1 O2