N~2~,N~2~,N~2~,N~2~,N~4~,N~4~,N~4~,N~4~,N~6~,N~6~-decamethyl-1,3,5,2lambda~5~,4lambda~5~,6lambda~5~-triazatriphosphinine-2,2,4,4,6,6-hexamine