Fmoc-beta-(S)-4-methoxyphenylalanine , its cas register number is 501015-30-1. It also can be called Benzenepropanoicacid, b-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-4-methoxy-,(bS)- ; (S)-Fmoc-4-methoxy-β-Phe-OH .