57710-57-3 84502-40-9 Avocettin BRN 5091359 Heptelidic acid Koningic acid Spiro(1H-2-benzoxepin-9,2'-oxirane)-4-carboxylic acid, 3,5a,6,7,8,9a-hexahydro-6-isopropyl-1-oxo- Spiro(2-benzoxepin-9(3H),2'-oxirane)-4-carboxylic acid, 1,5a,6,7,8,9a-hexahydro-6-(1-methylethyl)-1-oxo-