CREATE TABLE table_name_63 (formula VARCHAR, refractive_index_es__5893nm VARCHAR)

Which formula has a refractive index 589.3 at 1.97?
SELECT formula FROM table_name_63 WHERE refractive_index_es__5893nm = "1.97"
SELECT "formula" FROM "table_name_63" WHERE "1.97" = "refractive_index_es__5893nm"