Psoralen's shape allows it to fit right in a DNA groove and with sunlight it does this.

When Psoralens intercalates in the DNA it covalently bind to pyrimidines in one or both strands.
The cross-linking is a mutagenic and enhances cancer risk.

Socrates ” I don’t want that its unhealthy.”

Shmowephon “But Socrates Hemlock is all natural?”
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