1,3-Diazaspiro(4.4)nonane-6-heptanoic acid, 7-hexyl-2,4-dioxo-, monosodium salt, (5R-(5alpha,6alpha,7beta))- 137822-20-9 6-(6'-Carboxyhexyl)-7-N-hexyl-1,3-diazaspiro-(4-4)-nonan-2,4-dione Ibi-P 01028 Ibi-P-01028