Scale-Up of Trisodium [(3β,5β,12α)-3-[[4( S )-4-[Bis[2-[bis[(carboxy- kO )methyl]amino- kN ]ethyl]amino- kN ]-4-(carboxy- kO )-1-oxobutyl]amino]-12-hydroxycholan-24-oato(6-)]gadolinate(3-)], a Gd(III) Complex under Development As a Contrast Agent for MRI Coronary Angiography