PROBLEM TO BE SOLVED: To provide compounds, and pharmaceutical compositions of the same, that are inhibitors of FGFR enzymes and are useful in the treatment of FGFR-associated diseases such as cancer.SOLUTION: The present invention provides tricyclic compounds of formula I, and pharmaceutical compositions of the same.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】FGFR酵素の阻害剤であり、癌等のFGFR関連疾患の治療に有用である化合物およびその医薬組成物の提供。【解決手段】本発明は、式Iの三環式化合物、およびその医薬組成物を提供する。【選択図】なし