1,1,3,3-Tetramethylguanidine 142118-43-2 197451-33-5 80-70-6 AI3-51030 CCRIS 6689 EINECS 201-302-7 Guanidine, 1,1,3,3-tetramethyl- (8CI) Guanidine, N,N,N',N'-tetramethyl- N,N,N',N'-Tetramethylguanidine NSC 148309