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substances derived from petroleum, what substances are derived from petroleum, materials derived from petroleum, what is petroleum derived from, what is made from petroleum, petroleum is obtained from, what is in petroleum, what medicines are made from petroleum, products obtained from petroleum, what is petroleum made of chemistry, main constituent of petroleum is, products that come from petroleum, what is petroleum formed from, various constituents of petroleum, what form is petroleum found in naturally, what is petroleum composed of, chemical products in petroleum, mention the constituents of petroleum