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Robuta

https://webbook.nist.gov/cgi/cbook.cgi?ID=C22900443&Units=SI 21,22,23,24-Tetraoxapentacyclo[16.2.1.1(3,6).1(8,11).1(13,16)]tetracosa-3,5,8,10,13,15,18,20-octaene