1-Adamantylphosphonyldibenzo-17-crown-6 calcium complex 136370-89-3 Calcium(2+), bis(6,7,9,10,12,13-hexahydro-20-tricyclo(3.3.1.1(3,7))dec-1-yldibenzo(d,p)(1,3,6,9,12,15,2)hexaoxaphosphacycloheptadecin 20-oxide-O5,O8,O11,O14)-, diperchlorate Calcium(2+), bis(6,7,9,10,12,13-hexahydro-20-tricyclo(3.3.1.1(sup 3,7))dec-1-yldibenzo(d,p)(1,3,6,9,12,15,20)hexaoxaphosphacycloheptadecin 20-oxide-O(sup 5),O(sup 8),),O(sup 11), O(sup 14))-, diperchlorate