siemens

https://dx.doi.org/10.1351/goldbook.S05657
SI derived unit of electric conductance, S = Ω −1 = m −2 kg −1 s 3 A 2.
Source:
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 992