(2S)N-((2R,3S,4R)-2,4-Dihydroxy-3-methyl-pentanoyl)-2-methylserine 134381-30-9 Conagenin Conagenine L-Serine, N-(3,5-dideoxy-3-methyl-D-xylonoyl)-2-methyl- N-(3,5-Dideoxy-3-methyl-D-xylonoyl)-2-methyl-L-serine