RESIDUE 1BY 29 CONECT C5 3 C4 C6 H5 CONECT C4 3 C5 C3 H4 CONECT C6 3 C5 C7 H6 CONECT C7 3 C6 N2 H7 CONECT N2 2 C7 C3 CONECT C3 3 C4 N2 N1 CONECT N1 3 C3 C2 HN1 CONECT C2 4 N1 C1 H21 H22 CONECT C1 4 C2 P1 P2 H1 CONECT P1 4 C1 O1 O2 O3 CONECT O1 1 P1 CONECT O2 2 P1 HO2 CONECT O3 2 P1 HO3 CONECT P2 4 C1 O4 O5 O6 CONECT O4 2 P2 HO4 CONECT O5 2 P2 HO5 CONECT O6 1 P2 CONECT H5 1 C5 CONECT H4 1 C4 CONECT H6 1 C6 CONECT H7 1 C7 CONECT HN1 1 N1 CONECT H21 1 C2 CONECT H22 1 C2 CONECT H1 1 C1 CONECT HO2 1 O2 CONECT HO3 1 O3 CONECT HO4 1 O4 CONECT HO5 1 O5 END HET 1BY 29 HETNAM 1BY [2-(PYRIDIN-2-YLAMINO)ETHANE-1,1-DIYL]BIS(PHOSPHONIC AC HETNAM 2 1BY ID) FORMUL 1BY C7 H12 N2 O6 P2