F 1537 (OTTO) 3-Fluorobenzoic acid, 97% Cas 455-38-9 - used in the preparation of regulation of phenolic acid synthesis in Bacillus subtilis. F 1537 (OTTO) 3-Fluorobenzoic acid, 97% Cas 455-38-9 - used in the bacterial decarboxylation of o-phthalic acids.