Robuta

https://webbook.nist.gov/cgi/inchi/InChI%3D1S/C14H14O6/c1-19-10(7-15)5-8-3-2-4-9-6-11(13(16)17)14(18)20-12(8)9/h2-4%2C6%2C10%2C15H%2C5%2C7H2%2C1H3%2C(H%2C16%2C17) Mercumallylic acid acid