Robuta

https://webbook.nist.gov/cgi/cbook.cgi?ID=B3337&Units=CAL&Mask=40 (H2O)6..O3SCH2CH2SO3 dianion https://webbook.nist.gov/cgi/inchi?ID=B3334&Units=CAL&Mask=8 (H2O)3..O3SCH2CH2SO3 dianion