CREATE TABLE table_203_613 (id DECIMAL, "formula" TEXT, "color" TEXT, "symmetry" TEXT, "space group" TEXT, "no" DECIMAL, "pearson symbol" TEXT, "a  ( pm ) " DECIMAL, "b  ( pm ) " DECIMAL, "c  ( pm ) " DECIMAL, "z" DECIMAL, "density ,  g/cm3" DECIMAL)

what is the formula for the compound that has the same pearson symbol as pacl4 ?
SELECT "formula" FROM table_203_613 WHERE "formula" <> 'pacl4' AND "pearson symbol" = (SELECT "pearson symbol" FROM table_203_613 WHERE "formula" = 'pacl4')
SELECT "formula" FROM "table_203_613" WHERE "formula" <> 'pacl4' AND "pearson symbol" = (SELECT "pearson symbol" FROM "table_203_613" WHERE "formula" = 'pacl4')