A compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 independently represent H or an optionally substituted hydrocarbon group; R.sup.3 represents an optionally substituted hydrocarbon group; R.sup.4 represents H or a hydrocarbon group; ring A represents a substituted benzene ring; X represents a C.sub.2-4 alkylene group etc.; and Y represents a bond or a lower alkylene group, or salts thereof is useful as prophylactic or therapeutic agents of diseases related with melatonin activity.
公式为##STR1##其中R.sup.1和R.sup.2分别代表H或可选取代的碳氢基团; R.sup.3代表可选取代的碳氢基团; R.sup.4代表H或碳氢基团; 环A代表取代苯环; X代表C.sub.2-4烷基等; Y代表键或较低的烷基,或其盐,可用作预防或治疗与
褪黑激素活性相关的疾病的药物。