Begin with a central carbon that carries three different groups and has one double bond.
- One substituent is a double bond to a nitrogen, which in turn is bonded to a saturated five-member cyclopentyl ring (no other substitutions on that ring).
- A second substituent is a hydroxyl group directly attached to the same central carbon.
- The third substituent is a six-membered pyrimidine ring (also known as a 1,3-diazine). In this ring, the central carbon connects at ring carbon 6; the ring's nitrogen atoms occupy positions 1 and 3; ring carbon 4 carries a cyclopropylamino group (-NH-cyclopropyl, with the cyclopropyl group being a saturated three-carbon ring); and a methyl group is attached to ring carbon 2.
