Abstract: A compound of the formula (I): wherein X1 is bond or —OCH2—; X2 is —(CH2)n—, in which n is 1, 2 or 3; X3 is bond, —O—, —S—, —OCH2—, or —NH—; R1 is phenyl or pyridyl each of which may have one or two substituent(s) selected from the group consisting of hydroxy, halogen, etc.; R2 is hydrogen, (lower)alkoxycarbonyl, etc.; R3 is hydroxy(lower)alkyl; halo(lower)alkyl, etc.; R4 is aryl or unsaturated heterocyclic group, each of which may have one or two substituent(s) selected from the group consisting of lower alkyl, hydroxy, carbamoyl, halogen, lower alkoxy, etc.; and a salt thereof which is useful as a medicament.

Abstract: A compound of the formula (I) wherein X1 ? is bond or —O(CH2)m— (in which m is an integral number of 1, 2 or 3); X2 is bond, —(CH2)n—, etc. (in which n is an integral number of 1, 2 or 3); R1 is hydrogen or amino protective group; R2 is hydroxy(lower)alkyl or (lower)alkoxy(lower)alkyl; A is phenyl, pyridyl, indolyl or carbazolyl, each of which may be substituted with one or two substituent(s) selected from the group consisting of halogen, hydroxy, lower alkyl, etc.; and B is phenyl or pyridyl, each of which may be substituted with one or two substituent(s) selected from the group consisting of halogen, hydroxy, nitro, etc.; and a pharmaceutically acceptable salt thereof which is useful as a medicament.

Abstract: A compound of the formula [Ig]; wherein R1 is hydrogen or an amino protective group, R2 is hydrogen or hydroxy, and R3 and R4 are independently N-methyl-methoxycarbonylamino, N-ethyl-methoxycarbonylamino, N-propyl-methoxycarbonylamino or 3-ethylureid, or R3 and R4 are both methoxycarbonylamino substituted at a meta position of the benzene rings, or a salt thereof, and (2S)-1-phenoxy-3-[3,3-bis[4-methoxycarbonylamino)-phenyl]propylamino]-2-propanol sulfate (2:1) and some crystal forms thereof as &bgr;3adrenergic receptor agonists.

Abstract: A compound of the formula (I): 1