(S(R*,R*))-2,3-Dimethoxy-N,N,N',N'-tetramethylbutane-1,4-diamine 1,4-Butanediamine, 2,3-dimethoxy-N,N,N',N'-tetramethyl-, [S-(R*,R*)]- 26549-21-3 EINECS 247-794-7