| The grey spheres represent carbon atoms, the red ones oxygen and the white ones hydrogen. The two blue spheres are nitrogen atoms and the single yellow sphere is a sulphur atom. You can move the molecule by holding down the left mouse button and dragging the mouse. In the middle of the molecule is a square section, which gives penicillin its antibiotic effect. This is called a beta lactam ring. This form of penicillin has a benzyl group at one end of the molecule. This contains a 6-membered benzene ring - on the right of the molecule as it initially loads. |
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