This molecule starts as an amide in which the carbonyl carbon is bonded to a thiophene ring bearing a single methyl substituent. In the thiophene, the amide linkage is positioned adjacent to the sulfur, while the methyl group is located at the position meta to the amide linkage and ortho to the sulfur.

On the other side of the amide nitrogen, a six-membered tetrahydropyran ring (comprising five carbons and one oxygen) is attached. Number this ring so that the carbon directly bonded to the amide nitrogen is designated as C-4, then proceed sequentially around the ring as C-3, C-2, O-1, C-6, and C-5. Within the tetrahydropyran ring, both C-4 and C-3 are chiral centers; additionally, C-3 carries a methoxy group. The configuration at C-4 is R and at C-3 is S.