The OP states that the resin in question is sap from a plum tree, so it's probably primarily sugars, along with trace minerals and organic compounds.
Since the input is an uncharacterized mixture, it's hard to say what reaction is going on to change the smell. I'd try it again with just the sap and
the base and try to repeat the result, but without a mass spectrometer I don't know how far you'd get at characterizing the volatiles of interest.
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