Usage History of 'heterocycles'

The following chart shows how frequently 'heterocycles' appeared in printed materials over time. For example, the word 'heterocycles' occurred 6 times in books in 1908 and 1,177 times in 2008. From 1908 to 2008, the word 'heterocycles' was used a total of 51,296 times in books scanned by Google. See Reference: Google Ngram project.

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