Formation of -abscisic acid

Formation of abscisic acid 4.62), a plant growth regulator, is established to be from mevalonic acid 4.13) and involves loss of the (4-/>ro-5)-proton and (two-thirds) retention of the (4 ro-/ )-proton (at C-2). This is consistent with formation of 4.62), with its terminal... 

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