(4-Bromophenylethynyl)trimethylsilane16116-78-233 % similar Lithium (trimethylsilyl)acetylide54655-07-133 % similar 3-[2-(Trimethylsilyl)ethynyl]thiophene130995-13-032 % similar Tetrakis(trimethylsilyl)silane4098-98-031 % similar