10,11-Di-sec-butyl-12-phenyl-8,12-bis-trimethylsilanyl-10,11-diaza-1,9-diphospha-tricyclo[7.2.1.02,7]dodeca-2,4,6-triene

(5-Phenyl-1H-[1,2,4]diazaphosphol-3-yl)-phosphonic acid dimethyl ester

10,11-Dibutyl-12-phenyl-8,12-bis-trimethylsilanyl-10,11-diaza-1,9-diphospha-tricyclo[7.2.1.02,7]dodeca-2,4,6-triene

10,11-Dimethyl-12-phenyl-8,12-bis(trimethylsilyl)-10,11-diaza-1,9-diphosphatricyclo<7.2.1.02,7>dodeca-2,4,6-trien