Provided are novel low-molecular compounds which exhibit calcium receptor antagonist activity, and which are highly safe and orally administrable, namely, compounds having general formula (I) or pharmacologically acceptable salts thereof. In the general formula, A represents a single bond or the like； D represents a single bond or the like； R and R are the same or different from each other and represent a hydrogen atom, a halogen atom, or the like； R and R are the same or different from each other and represent a hydrogen atom, a halogen atom, or the like； R and R are the same or different from each other and represent a hydrogen atom, a halogen atom, or the like； R represents methyl, ethyl, or the like； m represents an integer of 0 to 6, or the like； and Z represents carboxyl or the like.
