What is a colorless, oily substance, C4H4O, obtained by distilling certain organic substances, as pine wood, salts of pyromucic acid, etc.; -- called also tetraphenol called?

furfuran — A colorless, oily substance, C4H4O, obtained by distilling certain organic substances, as pine wood, salts of pyromucic acid, etc.; -- called also tetraphenol. (Webster's 1913.)

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