2,2-Bis-diisopropylamino-6-oxo-1-phenyl-1,6-dihydro-2λ5-[1,5,2]diazaphosphinine-3,4-dicarboxylic acid dimethyl ester

N,N,N',N'-tetraisopropyl-1H-2l5-benzo[d][1,3,2]diazaphosphole-2,2-diamine