A saturated five-membered heterocycle containing four carbon atoms and one oxygen (tetrahydrofuran) is described, where only the carbon atom adjacent to the oxygen bears a substituent. This substituent is attached via a methylene (-CH2-) bridge to an amine group that is further connected through a sulfonyl (-SO2-) linkage to another five-membered heterocycle.
The latter heterocycle is composed of two nitrogen atoms and three carbon atoms (an aromatic pyrazole ring), with atoms numbered clockwise starting from one of the nitrogen atoms as N1, N2, C3, C4, and C5. The N1 position carries an ethyl substituent, while the C4 position is substituted with the aforementioned sulfonyl group.
