RESIDUE 3NP 13 CONECT O1 2 C1 HO1 CONECT O2 1 C1 CONECT O4 1 N1 CONECT O3 1 N1 CONECT C1 3 O1 O2 C2 CONECT C2 4 C1 C3 H21 H22 CONECT C3 4 C2 N1 H31 H32 CONECT N1 3 O4 O3 C3 CONECT HO1 1 O1 CONECT H21 1 C2 CONECT H22 1 C2 CONECT H31 1 C3 CONECT H32 1 C3 END HET 3NP 13 HETNAM 3NP 3-NITROPROPANOIC ACID FORMUL 3NP C3 H5 N1 O4