To illustrate a molecule with more than 9 rings, consider [[cephalostatin]]-1,<ref>National Center for Biotechnology Information (NCBI). name="PubChem-183413">{{cite Compound.web (accessed|title=CID May183413 12, 2012) [|url=https://pubchem.ncbi.nlm.nih.gov/summarycompound/summary.cgi?cid=183413 |website=[[PubChem]] Compound|accessdate=May CID12, 2012 |language=183413 (Cephalostatin-1)]en}}</ref> a steroidic 13-ringed [[pyrazine]] with the [[empirical formula]] C<sub>54</sub>H<sub>74</sub>N<sub>2</sub>O<sub>10</sub> isolated from the [[Indian Ocean]] [[hemichordate]] ''[[Cephalodiscus gilchristi]]'':
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:[[Image:Cephalostatine-1.svg|360px|''Molecular structure of cephalostatin-1'']]