Eudistomin C is a naturally occurring β-carboline derivative which has been found in the Ascidian, Eudistoma Olivaseum. Eudistomin C is a cytotoxic molecule; this cytotoxicity is achieved by the Eudistomin C binds onto the 40S or 80S Ribosomal subunits, which inhibits the process of protein translation, leading to cell death. There are cells that are resistance to Eudistomin Cs cytotoxicity, and these cells are called Yeast EudiC Resistance mutants (YER). YER mutants have a RPS14A mutation on the cells uS11 gene, which encodes for the cell's 40S ribosomal subunit. This produces the RPS14A 40S Ribosomal subunit which confers a resistance against Eudistomin C, preventing protein translation inhibition. Eudistomin C has also shown antitumor and antiviral properties. The exact mechanism of these properties are unknown, however it is believed that its ability to inhibit protein translation is responsible for its antitumor and antiviral properties.