| http://www.w3.org/ns/prov#value | - Particularly preferred hydrolyzable groups R are those which carry no substituents and lead to hydrolysis products of low molecular weight, examples being lower alcohols, such as methanol, ethanol,propanol, n-butanol, isobutanol, sec-butanol, and tert-butanol.At least one group R of the formula (B) must be a hydrolyzable group; compounds of the formula (B) having three or four hydrolyzable groups
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