RESIDUE 212 27 CONECT O2 2 P1 HO2 CONECT C7 4 C16 P1 P8 O14 CONECT O3 2 P1 HO3 CONECT C16 4 C7 C19 H161 H162 CONECT C19 4 C16 C22 H191 H192 CONECT O5 1 P1 CONECT C22 4 C19 N25 H221 H222 CONECT P1 4 O2 C7 O3 O5 CONECT O9 1 P8 CONECT P8 4 C7 O9 O10 O12 CONECT O10 2 P8 HO10 CONECT O12 2 P8 HO12 CONECT O14 2 C7 HO14 CONECT N25 3 C22 H251 H252 CONECT HO2 1 O2 CONECT HO3 1 O3 CONECT H161 1 C16 CONECT H162 1 C16 CONECT H191 1 C19 CONECT H192 1 C19 CONECT H221 1 C22 CONECT H222 1 C22 CONECT HO10 1 O10 CONECT HO12 1 O12 CONECT HO14 1 O14 CONECT H251 1 N25 CONECT H252 1 N25 END HET 212 27 HETSYN 212 (4-AMINO-1-HYDROXY-1-PHOSPHONO-BUTYL)PHOSPHONIC ACID HETNAM 212 ALENDRONATE FORMUL 212 C4 H13 N1 O7 P2