PROBLEM TO BE SOLVED: To provide a novel water-insoluble resin that has ultraviolet protection nature.SOLUTION: The present invention provides a resin having a molecular weight of several thousands to 60,000 with multiple carboxyl groups each having a tryptophan skeleton.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2017,JPO&INPIT【課題】紫外線防御の性質を有し、非水溶性の新規の樹脂を提供する。【解決手段】トリプトファン骨格を有するカルボキシル基を多数有する重量分子量数千~6万の樹脂。【選択図】図8