... quality, large quantity, competitive price Bortezomib Intermediate; (aR,3aS,4S,6S,7aR)-Hexahydro-3a,8,8-trimethyl-alpha-(2-methylpropyl)-4 ... crystalline powderIdentificationH-1 NMR,HPLCSpecific optical rotation+10°~+11°Loss on drying≤1.5%Assay (HPLC)≥98.0% Bortezomib Intermediate; (aR ... ,3aS,4S,6S,7aR)-Hexahydro-3a,8,8-trimethyl-alpha-(2-methylpropyl)-4 ...