3-({[3-(acetylamino)-5-{[(2,3-dihydroxypropyl)amino]carbonyl}-2,4,6-triiodophenyl]carbonyl}amino)-2-hydroxypropyl acetate compound with 1-({[3-(acetylamino)-5-{[(2,3-dihydroxypropyl)amino]carbonyl}-2,4,6-triiodophenyl]carbonyl}amino)-3-hydroxypropan-2-yl acetate (1:1)