1,7-Dioxaspiro[5.5]undecane,acanthifolicin deriv.; Spiro[3-oxa-7-thiabicyclo[4.1.0]heptane-2,2'-[2H]pyran],acanthifolicin deriv.; Spiro[furan-2(3H),2'(3'H)-pyrano[3,2-b]pyran],acanthifolicin deriv.
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