RESIDUE 7PA 21 CONECT O1 1 P2 CONECT O2 2 P2 HO2 CONECT C1 4 C2 P1 H11 H12 CONECT C2 4 C1 C3 H21 H22 CONECT P1 4 C1 O3 O4 O6 CONECT C3 4 C2 P2 H31 H32 CONECT P2 4 O1 O2 C3 O5 CONECT O3 1 P1 CONECT O4 2 P1 HO4 CONECT O5 2 P2 HO5 CONECT O6 2 P1 HO6 CONECT HO2 1 O2 CONECT H11 1 C1 CONECT H12 1 C1 CONECT H21 1 C2 CONECT H22 1 C2 CONECT H31 1 C3 CONECT H32 1 C3 CONECT HO4 1 O4 CONECT HO5 1 O5 CONECT HO6 1 O6 END HET 7PA 21 HETNAM 7PA PROPANE-1,3-DIYLBIS(PHOSPHONIC ACID) FORMUL 7PA C3 H10 O6 P2