Isobutyryl Groups Located on Different Rings

6-Dihydroxy-4-methoxy-3-methyl-5-(2-methyl-l-oxopropyl) phenyl]methyl]-3,5-dihydroxy-2,4-dimethyl-6-(2-methyl-l-oxopropyl)-2,5-cyclohexadien-l-one (Kosotoxin) 

BIOLOGICAL ACTIVITY Spasmolytic [8432] antitumor action [8439] anthelmintic against tapeworm [8441], 

Obtained by reaction of a 2,4-dihydroxy-6-methoxy-3-methylisobutyrophenone and 4,6-dihydroxy-2-methoxy-3-methyl-isobutyrophenone mixture with formaldehyde in the presence of 1% aqueous potassium hydroxide for 45 min at 0° (14%) [7255]. 

28 Aromatic Polyketones Containing Only Isobutyryl Groups 

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