RESIDUE 2PI 19 CONECT N 3 CA H HN2 CONECT CA 4 N C CB HA CONECT C 3 CA O OXT CONECT O 1 C CONECT OXT 2 C HXT CONECT CB 4 CA CG HB1 HB2 CONECT CG 4 CB CD HG1 HG2 CONECT CD 4 CG HD1 HD2 HD3 CONECT H 1 N CONECT HN2 1 N CONECT HA 1 CA CONECT HXT 1 OXT CONECT HB1 1 CB CONECT HB2 1 CB CONECT HG1 1 CG CONECT HG2 1 CG CONECT HD1 1 CD CONECT HD2 1 CD CONECT HD3 1 CD END HET 2PI 19 HETNAM 2PI 2-AMINO-PENTANOIC ACID FORMUL 2PI C5 H11 N1 O2