PROBLEMProvided are crystals of compound A which have properties suitable for industrial production.MEANS FOR SOLVINGAs the results of intensive studies to provide crystals of compound A having an inhibitory activity on the kinase activity of an EML4-ALK fusion protein and a mutant EGFR protein, crystals of compound A were found. Moreover, it was found that A04-type crystal of compound A, from among the aforesaid crystals of compound A, unexpectedly have preferred properties as a drug substance.
