3-Amino-2,3,6-trideoxy-3-C-methyl-L-lyxo-hexose is a branched-chain amino sugar also known as L-vancosamine. It's a key component of the antibiotic vancomycin and other related antibiotics. Specifically, it's found as a sugar component in the glycopeptide antibiotic vancomycin, which is important in treating methicillin-resistant Staphylococcus aureus. It also appears in other antibiotic structures as an O-glycoside or a C-glycoside.