Sulfuric acid 2(R)-[N-[1(R)-[(2S,3aR,5S,6S,7aS)-[N-[2-[2-[1-(diaminomethylene)-2,5-dihydro-1H-pyrrol-3-yl]ethyl]carbamoyl]-5,6-dihydroxyperhydroindol-1-ylcarbonyl]-3-methylbutyl]carbamoyl]-2-methoxyethyl ester