Ethyl 2-[2-[8-(3,5-dioxo-4-azatricyclo[5.2.1.02,6]dec-8-en-4-yl)quinolin-2-yl]-6-(2-ethoxy-2-oxoethyl)sulfanyl-3-hydroxy-4,7-bis(methylchloranuidyl)-1-oxoinden-5-yl]sulfanylacetate