{3-[(4-{3-[(4-{3-[(4,6-Dichloro-[1,3,5]triazin-2-ylamino)-methyl]-benzylamino}-6-pentylamino-[1,3,5]triazin-2-ylamino)-methyl]-benzylamino}-6-isobutylamino-[1,3,5]triazin-2-ylamino)-methyl]-benzyl}-carbamic acid tert-butyl ester