3H-1,2-Phosphastibol-4-amine,N-[2,6-bis(1-methylethyl)phenyl]-5-[(1E)-1-[[2,6-bis(1-methylethyl)phenyl]imino]ethyl]-2,2-dichloro-1,1,2,2-tetrahydro-1,1-diphenyl-, compd. withpentane (2:1)