An alkyl ether derivative represented by the following formula or a salt thereof for use in a method of preventing and/or treating male EBP disorder with X-linked dominant Conradi-Hunermann chondrodysplasia punctate, Smith-Lemli-Opitz Syndrome, lathosterolosis or desmosterolosis: wherein R 1 and R 2, which are the same or different, each represent one or more groups selected from a hydrogen atom, a halogen atom, an optionally substituted C 1-6 alkyl group, an optionally substituted aryl group, an optionally substituted ar-C 1-6 alkyl group, an optionally substituted C 1-6 alkoxy group, an optionally substituted aryloxy group, an optionally substituted C 1-6 alkylthio group, an optionally substituted arylthio group, an optionally substituted C 2-6 alkenyl group, an optionally substituted C 2-6 alkenyloxy group, an optionally substituted C 1-6 alkylamino group, an optionally substituted C 1-6 alkylsulfonyl group, an optionally substituted arylsulfonyl group, an optionally substituted carbamoyl group, an optionally substituted heterocyclic group, an optionally protected amino group, an optionally protected hydroxyl group, an optionally protected carboxyl group, a nitro group, and an oxo group; R 3 represents an optionally substituted C 1-6 alkylamino group, an optionally protected amino group, or an optionally protected hydroxyl group; and m and n, which are the same or different, each represent an integer of 1 to 6, wherein the amino-protecting group is an acyl group, a C 1 - 6 alkyloxycarbonyl group, an ar-C 1 - 6 alkyloxycarbonyl group, an aryloxycarbonyl group, an ar-C 1 - 6 alkyl group, a C 1 - 6 alkoxy C 1 - 6 alkyl group, an ar-C 1 - 6 alkyloxy C 1 - 6 alkyl group, an arylthio group, a C 1-6 alkylsulfonyl group, an arylsulfonyl group, or a substituted silyl group, wherein the hydroxyl-protecting group is an acyl group, a C 1 - 6 alkyloxycarbonyl group, an ar-C 1 - 6 alkyloxycarbonyl group, a heterocyclic oxycarbonyl group, a C 1 - 6 alkyl group, a C 2 - 6 alkenyl group, an ar-C 1 - 6 alkyl group, an oxygen-containing heterocyclic group, a sulfur-containing heterocyclic group, a C 1 - 6 alkoxy C 1-6 alkyl group, an ar-C 1 - 6 alkyloxy C 1-6 alkyl group, a C 1 - 6 alkylsulfonyl group, an arylsulfonyl group, or a substituted silyl group, and wherein the carboxyl-protecting group is a C 1-6 alkyl group, a C 2 - 6 alkenyl group, an aryl group, an ar-C 1 - 6 alkyl group, an acyl C 1-6 alkyl group, an arylthio C 1 - 6 alkyl group, an arylsulfonyl C 1-6 alkyl group, an oxygen-containing heterocyclic group, a C 1 - 6 alkylsilyl C 1-6 alkyl group, an acyloxy C 1 - 6 alkyl group, a nitrogen-containing heterocyclic C 1 - 6 alkyl group, a C 3 - 8 cycloalkyl group, a C 1-6 alkoxyC 1 - 6 alkyl group, an ar-C 1 - 6 alkyloxy C 1 - 6 alkyl group, a C 1 - 6 alkylthio C 1 - 6 alkyl group, or a substituted silyl group. wherein R 1 and R 2, which are the same or different, each represent one or more groups selected from a hydrogen atom, a halogen atom, an optionally substituted C 1-6 alkyl group, an optionally substituted aryl group, an optionally substituted ar-C 1-6 alkyl group, an optionally substituted C 1-6 alkoxy group, an optionally substituted aryloxy group, an optionally substituted C 1-6 alkylthio group, an optionally substituted arylthio group, an optionally substituted C 2-6 alkenyl group, an optionally substituted C 2-6 alkenyloxy group, an optionally substituted C 1-6 alkylamino group, an optionally substituted C 1-6 alkylsulfonyl group, an optionally substituted arylsulfonyl group, an optionally substituted carbamoyl group, an optionally substituted heterocyclic group, an optionally protected amino group, an optionally protected hydroxyl group, an optionally protected carboxyl group, a nitro group, and an oxo group; R 3 represents an optionally substituted C 1-6 alkylamino group, an optionally protected amino group, or an optionally protected hydroxyl group; and m and n, which are the same or different, each represent an integer of 1 to 6, wherein the amino-protecting group is an acyl group, a C 1 - 6 alkyloxycarbonyl group, an ar-C 1 - 6 alkyloxycarbonyl group, an aryloxycarbonyl group, an ar-C 1 - 6 alkyl group, a C 1 - 6 alkoxy C 1 - 6 alkyl group, an ar-C 1 - 6 alkyloxy C 1 - 6 alkyl group, an arylthio group, a C 1-6 alkylsulfonyl group, an arylsulfonyl group, or a substituted silyl group, wherein the hydroxyl-protecting group is an acyl group, a C 1 - 6 alkyloxycarbonyl group, an ar-C 1 - 6 alkyloxycarbonyl group, a heterocyclic oxycarbonyl group, a C 1 - 6 alkyl group, a C 2 - 6 alkenyl group, an ar-C 1 - 6 alkyl group, an oxygen-containing heterocyclic group, a sulfur-containing heterocyclic group, a C 1 - 6 alkoxy C 1-6 alkyl group, an ar-C 1 - 6 alkyloxy C 1-6 alkyl group, a C 1 - 6 alkylsulfonyl group, an arylsulfonyl group, or a substituted silyl group, and wherein the carboxyl-protecting group is a C 1-6 alkyl group, a C 2 - 6 alkenyl group, an aryl group, an ar-C 1 - 6 alkyl group, an acyl C 1-6 alkyl group, an arylthio C 1 - 6 alkyl group, an arylsulfonyl C 1-6 alkyl group, an oxygen-containing heterocyclic group, a C 1 - 6 alkylsilyl C 1-6 alkyl group, an acyloxy C 1 - 6 alkyl group, a nitrogen-containing heterocyclic C 1 - 6 alkyl group, a C 3 - 8 cycloalkyl group, a C 1-6 alkoxyC 1 - 6 alkyl group, an ar-C 1 - 6 alkyloxy C 1 - 6 alkyl group, a C 1 - 6 alkylthio C 1 - 6 alkyl group, or a substituted silyl group.