L-Threonine,O-(1,1-dimethylethyl)-N-[(9H-fluoren-9-ylmethoxy)carbonyl]-N-methyl- (CAS NO.117106-20-4) is also called N-Fmoc-N-Methyl-O-tert-butyl-L-threonine ; Fmoc-N-Me-Thr(tBu)-OH ; O-tert-butyl-N-[(9H-fluoren-9-ylmethoxy)carbonyl]-N-methyl-L-threonine .