Profile: Shanghai HW Additive Co., Ltd. specializes in manufacturing & dealing in pharmaceutical chemical products and plant abstraction products. Pharmaceutical intermediates are divided into four series, including cyanoacetic acid & derivatives, pyrimidines & derivatives, purines & derivatives and nucleosides. Our products include 2,4,5-triamino-6-hydroxy pyrimidine sulfate, 2,4,5,6-tetraamino pyrimidine sulfate or hydrochloride, guanine, 2,5-diamino-4, 6-dihydroxy pyrimidine hydrochloride, ethyl cyanoacetate, uracil and 6-chloro guanine.