[(3R,4S)-3,4-dihydroxy-5-methylsulfanyl-2-oxopentyl] phosphate [(3R,4S)-3,4-dihydroxy-5-methylsulfanyl-2-oxo-pentyl] phosphate [(3R,4S)-3,4-dihydroxy-5-(methylthio)-2-oxopentyl] phosphate [(3R,4S)-3,4-dihydroxy-2-keto-5-(methylthio)pentyl] phosphate