Structure of a highly potent anxiolytic dipeptoid

[R-(R @0 3 8 ,R @0 3 8 )]-4-[[2-[[3-(1H-Indol-3-yl)-2-me thyl-1-oxo-2-[(tricyclo[3.3.1.1 3,7 ]dec-2-yloxy)carb onyl]amino]propyl]amino]-1-phenylethyl]amino]-4- oxobutanoic acid, C 35 H 42 N 4 O 6 , M r =614.748, ortho rhombic, P2 1 2 1 2 1 , a=13.341 (2), b=13.643 (2), c=18.222 (2) A, V=316.61 A 3 , Z=4, D m =1.24, D x =1.23 Mg m -3 , Mo Kα radiation, λ=0.71069 A, μ=0.050 mm -1 , F(000)=1312, room temperature, R=0.0497 for 5121 obs erved reflections