公开(公告)号：US20190211016A1

公开(公告)日：2019-07-11

申请号：US16311700

申请日：2017-06-21

Applicant: YEDA RESEARCH AND DEVELOPMENT CO. LTD.

Inventor： Dvir GUR ,  Lia ADDADI ,  Stephen WEINER

IPC: C07D473/18

CPC classification number: C07D473/18 ,  C07B2200/13

Abstract: This invention is directed to synthetic co-crystals of anhydrous guanine and at least one additional material, wherein the co-crystals have a high refraction index and therefore, provide products with pearlescence or whiteness with high coverage. The invention is further directed to a process for the preparation of anhydrous guanine and of the co crystals.