RESIDUE 3HR 15 CONECT C1 3 O1 C2 O3 CONECT O1 1 C1 CONECT C2 4 C1 C3 H2 H2A CONECT O2 2 C3 HO2 CONECT C3 4 C2 O2 C4 H3 CONECT O3 2 C1 HO3 CONECT C4 4 C3 H4 H4A H4B CONECT H2 1 C2 CONECT H2A 1 C2 CONECT HO2 1 O2 CONECT H3 1 C3 CONECT HO3 1 O3 CONECT H4 1 C4 CONECT H4A 1 C4 CONECT H4B 1 C4 END HET 3HR 15 HETNAM 3HR (3R)-3-hydroxybutanoic acid FORMUL 3HR C4 H8 O3