(S)-2-Amino-3-(3,4-dihydroxy-phenyl)-2-methyl-propionic acid 1-(2,2-dimethyl-propionyloxy)-ethyl ester, (R,S)-1-pivaloyloxyethyl (S)-3-(3,4-dihydroxyphenyl)-2-methylalaninate, 1-pivaloyloxyethyl (S)-3-(3,4-dihydroxyphenyl)-2-methylalaninate,
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