Disclosed is a novel compound that acts as an antagonist for P2X3 and/or P2X2/3 receptors. Also disclosed is a pharmaceutical composition that exhibits analgesic activity or acts to ameliorate urinary problems, said composition containing: a compound represented by formula (I), a pharmacologically permitted salt thereof, or a solvate of either. In the formula, Rh and Rj together form a bond； Ra and Rb, and/or Rd and Re, together form an oxo or the like； Rc represents hydrogen, a substituted or unsubstituted alkyl, or the like； -Rf represents -(CR4aR4b) n -R2； R4a and R4b represent hydrogen, a substituted or unsubstituted alkyl, or the like； R2 represents a substituted or unsubstituted cycloalkyl or the like； n represents an integer from 1 to 4； -Rg represents -X-R3； -X- represents -O-, -S-, or the like； and R3 represents a substituted or unsubstituted cycloalkyl or the like.
