... , protein nitrogen heterocyclic indene, inspection of three phenol and tannin acid.In the pharmaceutical industry, for the production of antihypertensive drug ... vanillin,ethyl vanillin,guaiacol,o-Nitrochlorobenzene,o-Aminoanisole,ortho-Vanillin,glyoxylic acid and others now. With annual sales of more than 20 ...