prov:value
| - toms thereof to the indicated h terminal oxygen atom or atoms, R19 denotes an organic radical of valency h, linked through a carbon atom thereof, other than the carbon atom of a carbonyl group, R20 denotes CH3 --, C2 H5 --, or CH2 ???CHCOOCH2 --, R21 denotes an alkyl group of 1 to 6 carbon atoms, a monohydroxyalkyl group of 1 to 6 carbon atoms, or a dialkylaminoalkyl group, d is an integer of from
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