Patent ID: 8324272

Claim:
A compound chosen from: (1R,2R)-2-acetyloxy-1-methylpropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate hydrochloride; (1R,2R)-1-methyl-2-(2-methylpropanoyloxy)propyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate mesylate; (1R,2R)-2-ethoxycarbonyloxy-1-methylpropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate hydrochloride; (1R,2R)-2-isopropoxycarbonyloxy-1-methylpropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate hydrochloride; (1R,2R)-1-methyl-2-(2-methylpropoxycarbonyloxy)propyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate, hydrochloride; and (1R,2R)-1-methyl-2-pentyloxycarbonyloxypropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate hydrochloride.