(2S)-N-[(1S)-2-[4-[(6aS)-3-[3-[[(6aS)-2-methoxy-8-(4-methoxyphenyl)-11-oxo-6a,7-dihydropyrrolo[2,1-c][1,4]benzodiazepin-3-yl]oxy]propoxy]-2-methoxy-11-oxo-6a,7-dihydropyrrolo[2,1-c][1,4]benzodiazepin-8-yl]anilino]-1-methyl-2-oxo-ethyl]-2-[3-[2-[2-[2-[2-[[4-(2-azatricyclo[10.4.0.0⁴⁹]hexadeca-1(16),4,6,8,12,14-hexaen-10-yn-2-yl)-4-oxo-butanoyl]amino]ethoxy]ethoxy]ethoxy]ethoxy]propanoylamino]-3-methyl-butanamide