Beer Lille ether type quinazoline derivatives

摘要

The present invention provides a novel compound having an EGFR tyrosine kinase having an exon 20 insertion mutation and / or a pharmaceutically acceptable salt having HER2 tyrosine kinase inhibitory action with exon 20 insertion mutations.A compound represented by general formula (I) or its pharmaceutically acceptable salt. Here, R1, R2, R3, R4, R5 and R6 in formula (I) are synonymous with the definitions in the specification.