CREATE TABLE table_79168 ("Enzyme" CLOB, "Location" CLOB, "Substrate" CLOB, "Product" CLOB, "Chromosome" CLOB, "OMIM" FLOAT, "Porphyria" CLOB)

Which substrate has an OMIM of 176000?
SELECT "Substrate" FROM table_79168 WHERE "OMIM" = '176000'
SELECT "Substrate" FROM "table_79168" WHERE "OMIM" = '176000'