L-Argininamide, N-((phenylmethoxy)carbonyl)-L-isoleucyl-L-prolyl-N-(3-oxo-6'-((N2-(1-(N-((phenylmethoxy)carbonyl)-L-isoleucyl)-L-prolyl)-L-arginyl)amino)spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3'-yl)-, trans-