RESIDUE 4NG 20 CONECT CAA 3 CAE NAB OAG CONECT CAC 4 CAD NAB OAH H1 CONECT CAD 4 CAC CAE H2 H3 CONECT CAE 4 CAA CAD PAI H4 CONECT NAB 3 CAA CAC OAF CONECT OAF 2 NAB H5 CONECT OAG 1 CAA CONECT OAH 2 CAC H6 CONECT OAJ 2 PAI H7 CONECT OAK 1 PAI CONECT OAL 2 PAI H8 CONECT PAI 4 CAE OAJ OAK OAL CONECT H1 1 CAC CONECT H2 1 CAD CONECT H3 1 CAD CONECT H4 1 CAE CONECT H5 1 OAF CONECT H6 1 OAH CONECT H7 1 OAJ CONECT H8 1 OAL END HET 4NG 20 HETNAM 4NG [(3S,5S)-1,5-dihydroxy-2-oxopyrrolidin-3-yl]phosphonic HETNAM 2 4NG acid FORMUL 4NG C4 H8 N1 O6 P1