8,9-dimethoxy-2,2-dimethylpyrano[3,2-c]chromen-5-one

8-methylspiro[4.5]dec-8-ene-1,4-dione

7-methylspiro<4.5>dec-7-ene-1,4-dione

蒽

4-methyl-1-(3-nitrophenyl)-2,3-dihydro-1λ⁵-phosphole 1-oxide