| 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 beta3 adrenergic receptor agonists. |