hexapropyl-distannoxan Hexapropyldistannoxane Tripropyltin oxide Bis[tripropylstannyl] oxide Oxybis(tripropylstannane) 1,1,1,3,3,3-hexapropyl-distannoxan 1,1,1,3,3,3-Hexapropyldistannoxane Bis(tri-n-propyltin) oxide