Spiro[4H-cyclopropa[4,5]pentaleno[1,6a-c]pyran-1(2H),2'-oxirane]-5-carboxylicacid, 4a,6a,6b,7,7a,8-hexahydro-7a-methyl-2-oxo-, [1R-(1a,4aa,6ab,6bb,7ab,8aR*)]-; Pentalenolactone P
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