... /Exp Co.,Ltd.CERTIFICATE OF ANALYSISProduct Name: PterostilbeneCAS NO.: 537-42-8Molecular Formula: C16H16O3Batch N0.: 20100110Quantity: 50KGSManufacture Date:Jan, 10th, 2010Analysis ... lightShelf life 2 years when properly stored. pterostilbene CAS 537-42-8, 25-99%