prov:value
| - yl groups such as an ethyl group, a methyl group, a propyl group, a butyl group, a t-octyl group, etc.; R5 and R6, which may be the same or different, each is a hydrogen atom, an aralkyl group, e.g., a (2,6-di-t-butyl-4-hydroxyphenyl)ethyl group, etc. or an alkoxycarboxyalkyl group, e.g., a methoxycarboxyethyl group, etc., each of these organic groups having 20 or less carbon atoms.
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