for the following products
D-Arabinonic acid,2-c-methyl-4,5-O-(1-methylethylidene)-,ethylester | Ethyl (2S,3R)-3-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2,3-dihydroxy-2-methyl-propanoate and 2-C-methyl-4,5-O-(1-methylethylidene)-D-arabinonic acid ethyl ester