To obtain an effective and safe heart protecting agent.
This heart protecting agent is characterized by comprising a compound represented by formula (I) [Ar1 is a phenyl group which may contain a substituent group, or the like; a nitrogen-containing heterocyclic part is a 1,4-dihydropyridine ring or a pyridine ring; Z is a group represented by formula (II) (R4 and R5 are each a 1-12C alkoxy group, or the like, or R4 and R5 are bonded to form an OYO (Y is a straight-chain 2-4C alkylene group which may contain a substituent group), or the like; R1 exists only when A1 contains the 1,4-dihydropyridine ring and is an ANR6R7 or AN(CH2CH2)2O, or the like; R2 is a 1-4C alkyl group, or the like; R3 is AN[(CH2)mAr2][(CH2)nAr3] or AQ (Q is 4-(Ar2)2CH-1-piperazinyl, or the like), or the like} or its pharmaceutically acceptable salt.
TANAKA HIKARI
MATSUDA SATOYUKI
YAMASHITA TORU
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