... Isoleucine, l-isoleucine granular, 73-32-5 Molecular Weight,131.17 CAS No:73-32-5. GMP Certificated FactoryL-Isoleucine, l- ... UPS24, FCCIV and ect.ItemSpecificationsUSP24FCCIVAppearanceWhite crystals or crystalline powderAssay,%98.5~101.598.5~101.5Specific optical rotation+38.9°~ +41.8°+38.6 ... °~ +41.5°pH Value5.5~7.05.5~7.0Loss on drying, %≤0. ...