Enter a clue or pattern or both:
The Clue
Compound whence caffeine is derived (6 letter answer)
The Answer
PURINE
Tags
Notes
The answer PURINE is so rare that it appears less than once every 2500 puzzles.
Definition
PURINE as a noun:
1. any of several bases that are derivatives of purine
2. a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances