Heptamethyldisilazane,99% Cas:920-68-3,134340-00-4 or 37074-17-2 EINECS:213-061-5 Group-protecting agent Specification:App:Colorless, transparent liquid ... :bob at hnkingway dot comHenan Kingway Chemicals Co., Ltd. Heptamethyldisilazane,Cas:920-68-3,134340-00-4 , 37074-17-2