O7885 SIGMA Okadaic acid potassium salt from Prorocentrum concavum ≥90% (HPLC), powder Synonym: OA CAS Number 155751-72-7 Empirical Formula (Hill Notation) C44H67KO13 Molecular Weight 843.09 assay ≥90% (HPLC) form powder color white solubility H2O: soluble0.1 mg/mL DMSO: soluble ethanol: soluble storage temp. −20°C