Begin with a five-membered thiophene ring (four carbons and one sulfur). Number the ring so that sulfur is position 1 , with ring carbons at positions 2 , 3, 4, and 5 in a clockwise direction.
- At ring carbon 2, attach a two-carbon chain. The carbon farther from the ring (second in that chain) bears a methoxy group.
- At ring carbon 3, place a methoxy group.
- At ring carbon 5, attach a single tertiary carbon which is further substituted by an ethyl group and a methoxy group.
No stereochemical centers are present.