CAS Number
Every chemical substance, including chemical compounds, that has been described in the literature carries a unique numerical identifier, its CAS number.
Read more about this topic: Chemical Compound
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“In proportion as our inward life fails, we go more constantly and desperately to the post office. You may depend on it, that the poor fellow who walks away with the greatest number of letters, proud of his extensive correspondence, has not heard from himself this long while.”
—Henry David Thoreau (1817–1862)