3-Pyridinecarboxylic acid,6-[[3-[2-[[(2S)-3-[(1',2'-dihydro-2'-oxospiro[cyclopentane-1,3'-[3H]indol]-4'-yl)oxy]-2-hydroxypropyl]amino]-2-methylpropyl]-1H-indol-7-yl]oxy]-,monohydrochloride