6,11-dioxo-3,4,6,11-tetrahydro-1H-spiro[tetracene-2,2'-[1,3]dioxolan]-12-yl pivalate

(2R,3S,6S)-2-Ethynyl-3-hydroxy-6-((E)-4-oxo-but-2-enyl)-3,6-dihydro-2H-pyridine-1-carboxylic acid methyl ester

4,5-dihydroxy-1,2-dimethyl-9,10-anthraquinone