Thiacloprid, C10H9ClN4S, packs five elements into 25 atoms: 10 carbons, 9 hydrogens, 4 nitrogens, one sulfur and one chlorine. There is a ring at each end. The five-membered ring holds the sulfur and a nitrogen; the six-membered one is an aromatic pyridine-type ring with the chlorine on the carbon next to its ring nitrogen. A CH2 bridge links the two rings.

The nice detail is the side chain on the five-membered ring: a carbon-nitrogen double bond running straight into a carbon-nitrogen triple bond (a nitrile). So one model shows single, double, triple and aromatic bonds, 26 bonds in total. No stereocentres.

Every sphere has its element symbol engraved, so the S, Cl and N atoms are easy to spot without painting. Print in PLA with supports under the bonds and lower spheres, scale it up in your slicer, and use a fine layer height for crisp letters.

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