(R)-5-Chloro-3,4-dihydro-8-hydroxy-3-methyl-1-oxo-1H-2-benzopyran-7-carboxylic acid 19165-63-0 1H-2-Benzopyran-7-carboxylic acid, 5-chloro-3,4-dihydro-8-hydroxy-3-methyl-1-oxo-, (R)- Ochratoxin alpha