(R)-3-(((1R,4R)-1-(hydroxymethyl)-5,7,8-trimethoxy-2-(4-methoxybenzyl)-6-methyl-3-oxo-1,2,3,4-tetrahydroisoquinolin-4-yl)thio)-2-(((2,2,2-trichloroethoxy)carbonyl)amino)propanoic acid