Doxycycline is an antibiotic used to treat a wide variety of bacterial infections. The structure of doxycycline given below. Answer the questions about this structure. Which orbitals are used for bonding by: (Check all that apply) Determine the configuration of carbon atoms C and D. What is the geometric descriptor for the ring fusion at E? Which type of carbon is at the positions A and D? Identify the functional groups F, G, H, and I.