Enter a clue or pattern or both:
The Clue
Viagra, chemically (8 letter answer)
The Answer
CITRATES
Tags
Notes
The answer CITRATES is so rare that it appears less than once every 2500 puzzles.
Definition
CITRATE as a noun:
1. a salt or ester of citric acid
CITRATE as a verb:
1. cause to form a salt or ester of citric acid