an isomeric modification of tartaric acid that is sometimes found in the juice of grapes in conjunction with the common dextrorotatory form and is optically inactive but can be separated into the two usual isomeric forms, dextrorotatory and levorotatory.
An optically inactive form of tartaric acid that can be separated into dextrorotatory and levorotatory components and is sometimes found in grape juice. Chemical formula:C4H6O6.
