2,10,10-Trimethyl-5,7-dioxatricyclo[6.4.0.0^{2,6}]dodec-1(8)-ene-4,12-dione 1g

2,10,10-Trimethyl-5,7-dioxatricyclo[6.4.0.0^{2,6}]dodec-1(8)-ene-4,12-dione 1g