3732-82-9 AI3-50918 BRN 1906928 ENT 50918 HMPTS Hexamethylphosphorothioic triamide Hexamethylthiophosphoramide Hexamethylthiophosphoric triamide PHOSPHOROTHIOIC TRIAMIDE, HEXAMETHYL- Thio-HMPA Thiohempa Thiopol