19-Norkaur-16-en-18-oic acid, 2-((6-O-(4-((4-azido-2-nitrophenyl)amino)-1-oxobutyl)-2-O-(3-methyl-1-oxobutyl)-3,4-di-O-sulfo-beta-D-glucopyranosyl)oxy)-15-hydroxy-, dipotassium salt, (2beta,4alpha,15alpha)-