1 XDP D-xylulose-2,2-diol-1,5-bisphosphate 1.000 2 RUB Ribulose-1,5-diphosphate 0.947 3 XBP Xylulose-1,5-bisphosphate 0.947 4 CAP 2-carboxyarabinitol-1,5-diphosphate 0.818