2,5,5-Trimethyl-3,4,6,7,8,9-hexahydro-cyclohepta(b)pyran-2-carboxylic Acid, Methyl Ester

3,12,12-trimethylspiro[5.6]dodec-3-en-7-one

8-hydroxyimino-3,12,12-trimethylspiro[5.6]dodec-3-en-7-one

8-diazonio-3,12,12-trimethylspiro[5.6]dodeca-3,7-dien-7-olate