Crystal structure and spectroscopic study of 6a,7a,13b,13c-tetrahydro-6a-hydroxy-2,3,11,12-tetramethoxy-6,6,8,8-tetramethyl-6H,8H-bischromeno-[3,4-b:4?,3?-d]furan, a dimer of precocene II 3,4-epoxide

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