Wiktionary
muramic acid
n. (context organic compound English) A compound of glucosamine and lactic acid that occurs as a component of peptidoglycan
Wikipedia
Muramic acid
Muramic acid is an amino sugar acid. In terms of chemical composition, it is the ether of lactic acid and glucosamine. It occurs naturally as N-acetylmuramic acid in peptidoglycan, whose primary function is a structural component of many typical bacterial cell walls.