The present invention addresses the problem of providing a novel compound which has NK1
receptor antagonistic activity and which is useful in the prevention and treatment of
nausea and
vomiting accompanying the administration of antineoplastic agents. The present invention pertains to a compound represented by formula (I) (in the formula, W represents a
fluorine atom or the like, ring A representsa cycloalkyl or the like, X1 represents CH or N, R represents a
methyl group or the like, Y represents a number from 0 to 2, and U1, U2, and U3 each independently represent a
single bond or the like), or a pharmacologically acceptable salt thereof. This compound or pharmacologically acceptable salt thereof has excellent NK1
receptor antagonistic activity and is useful as a prophylactic or therapeutic agent for
nausea and
vomiting accompanying the administration of antineoplastic agents.