1H-Naphtho[2,1-b]pyran-3-acetic acid, dodecahydro-3,4a,7,7,10a-pentame thyl-, methyl ester;Dodecahydro-3,4a,7,7,10a-pentamethyl-1H-naphtho[2,1-b]pyran-3-acetic acid methyl ester
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