Isoadhumulone

2-(2-Methylbutyryl)-3,4-dihydroxy-5-(3-methyl-2-butenyl)-4-(4-methyl-3-pentenoyl)-2-cyclopentene-1-one

2-(2-Methylbutanoyl)-3,4-dihydroxy-4-(4-methyl-3-pentenoyl)-5-(3-methyl-2-butenyl)-2-cyclopentene-1-one

3,4-Dihydroxy-5-(3-methyl-2-butenyl)-2-(2-methyl-1-oxobutyl)-4-(4-methyl-1-oxo-3-pentenyl)-2-cyclopenten-1-one

3,4-dihydroxy-5-(3-methylbut-2-enyl)-2-(2-methyl-1-oxobutyl)-4-(4-methyl-1-oxopent-3-enyl)cyclopent-2-en-1-one