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"1-[(3R,4aR,5S,6S,6aS,10S,10aR,10bS)-3-Ethenyldodecahydro-6,10,10b-trihydroxy-3,4a,7,7,10a-pentamethyl-1-oxo-1H-naphtho[2,1-b]pyran-5-yl] Ester Butanedioic Acid-13C4; 1H-Naphtho[2,1-b]pyran Butanedioic Acid Deriv.-13C4;",Stable Isotopes
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