Abstract: A steroid compound represented by the formula ##STR1## which has an excellent aromatase-inhibiting effect and is useful for preventing or treating diseases caused by estrogens, such as breast cancer, uterine cancer and prostatomegaly. This compound has an oxygen or nitrogen atom as the heteroatom at the position A of the ring D and the 7-position (substituent R.sup.1) of the skeleton is substituted by --S--R.sup.2 (wherein R.sup.2 represents hydrogen, lower alkyl which may be substituted by hydroxy, amino or lower alkoxycarbonyl, lower alkenyl, aralkyl, aryl which may be substituted by halogen, amino, di(lower alkyl)amino, lower alkoxy or lower alkyl, acyl, or lower alkoxycarbonyl), --S(O)m--R.sub.3 (wherein R.sup.3 represents lower alkyl; and m represents 1 or 2), or aralkyl.

Abstract: Compounds are described having the formula ##STR1## wherein A denotes C.dbd.O, CH.sub.2, C.dbd.CH.sub.2 or C.dbd.CH-lower alkyl;B denotes O, NH or N-lower alkyl;X does not exist, or denotes C.dbd.O or CH.sub.2 ;n denotes 2 or 3 when X does not exist, or denotes 1 or 2 when X denotes C.dbd.O or CH.sub.2 ; andthe broken line between the 1- and 2-positions of the steroid skeleton means that a double bond may optionally exist there. These compounds have an aromatase inhibition action and are useful for prophylaxis or treatment of diseases caused by excess of estrogens, for example, breast cancer, uterine cancer, prostatic hypertrophy, etc.

Abstract: A benzothiophene derivative represented by the formula ##STR1## or a salt thereof has an excellent antiestrogenic activity, and is useful as a therapeutic agent of breast cancer, endometrial cancer, endometriosis, mastopathy, etc.This compound is characterized in that the 2-position (the substituent R.sup.2) of the benzothiophene nucleus is substituted by a halogen atom; a lower alkyl group; or a cycloalkyl or cycloalkenyl group optionally substituted by a lower alkyl group, a hydroxyl group, acyloxy group or an oxo group.

Abstract: A pyridazinone compound represented by the general formula ##STR1## wherein Ar is ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 may be identical or different, and each represents a hydrogen atom, a lower alkyl group, a trifluoromethyl group, a halogen atom, a cyano group or a nitro group, and R.sup.4 represents a hydrogen atom, a lower alkoxy group, or a lower alkyl group substituted by a lower alkoxy group or a carbamoyl group, and C* is an assymmetric carbon atom,or a salt thereof. This compound is useful for the treatment of diseases of the circulatory system.

Abstract: A pyridazinone compound represented by the general formula ##STR1## wherein Ar is ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 may be identical or different, and each represents a hydrogen atom, a lower alkyl group, a trifluoromethyl group, a halogen atom, a cyano group or a nitro group, and R.sup.4 represents a hydrogen atom, a lower alkoxy group, or a lower alkyl group substituted by a lower alkoxy group or a carbamoyl group, and C* is an assymmetric carbon atom,or a salt thereof. This compound is useful for the treatment of diseases of the circulatory system.

Abstract: A pyridazinone compound represented by the general formula ##STR1## wherein Ar is ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 may be identical or different, and each represents a hydrogen atom, a lower alkyl group, a trifluoromethyl group, a halogen atom, a cyano group or a nitro group, and R.sup.4 represents a hydrogen atom, a lower alkoxy group, or a lower alkyl group substituted by a lower alkoxy group or a carbamoyl group, and C* is an asymmetric carbon atom, or a salt thereof. This compound is useful for the treatment of diseases of the circulatory system.

Abstract: A compound represented by the following formula ##STR1## wherein A represents a hydrogen atom or a lower alkanoyl group, Z represents an oxygen atom or the group ##STR2## in which R represents a hydrogen atom or a lower alkyl group, and X represents a halogen atom, the compound being useful for controlling androgen-dependent diseases, particularly for preventing abortion or for contraception.

Abstract: A pyridazinone derivative represented by the following general formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group, either one of R.sub.2, R.sub.3 and R.sub.4 represents a hydrogen atom and the remaining two of them represent a lower alkyl group, a trifluoromethyl group, a halogen atom, a cyano group or a nitro group, and a salt thereof. The compounds are useful as antihypertensive agents.

Abstract: A compound represented by the following formula ##STR1## wherein A represents a hydrogen atom or a lower alkanoyl group, Z represents an oxygen atom or the group ##STR2## in which R represents a hydrogen atom or a lower alkyl group, and X represents a halogen atom, the compound being useful for controlling androgen-dependent diseases, particularly for preventing prostatic hypertrophy.

Abstract: Phenoxypropylamine derivatives of the general formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl or ethyl group, R.sub.2 and R.sub.3, independently from each other, represent a lower alkyl group, or together form a linear alkylene group having 4 to 7 carbon atoms which may be optionally substituted by a hydroxyl or hydroxymethyl group, and R.sub.4 represents a hydrogen atom or a group of the formula --R.sub.5 --Z in which R.sub.5 represents a lower alkylene group, and Z represents a hydrogen atom or an amino, mono- or di-(lower alkyl)-amino, hydrdoxy lower alkylamino, lower alkanoylamino, hydroxyl, lower alkoxy, lower alkanoyloxy, phenoxy, halophenoxy, benzoyloxy or halobenzoyloxy group, andthe salts thereof; to a process for production thereof; and to their medicinal use, particularly to antiulcer agents comprising these phenoxypropylamine derivatives or their salts.