= Cephalosporin C
<Cephalosporin C> is a fungal <natural product> in the beta-lactam antibiotic family, with formula $\mathrm{C_{16}H_{21}N_3O_8S}$. Its framework contains a strained four-membered cyclic <amide> fused to a sulfur-containing six-membered ring.<PubChem Compound database by National Center for Biotechnology Information>[Cephalosporin C, CID65536: formula, connectivity and fungal-metabolite classification]{ref}
For synthetic chemistry, the challenge is the combination of reactive rings, several functional groups and defined <stereochemistry>. Making the correct elemental formula is therefore a much weaker test than constructing the complete structure. This compound supplies a concrete example of why <total synthesis> needs control over connectivity and spatial arrangement together.
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