1-Adamantylphosphonyldibenzo-17-crown-6 90275-27-7 BRN 6027118 Dibenzo(d,p)(1,3,6,9,12,15,2)hexaoxaphosphacycloheptadecin, 6,7,9,10,12,13-hexahydro-20-tricyclo(3.3.1.1(sup 3,7))dec-1-yl-, 20-oxide