what is the subtrate for enzyme ala dehydratase
CREATE TABLE "biosynthesis" (
  "enzyme" text,
  "location" text,
  "substrate" text,
  "product" text,
  "chromosome" text,
  "ec" text,
  "omim" real,
  "porphyria" text
);
SELECT "substrate" FROM "biosynthesis" WHERE "enzyme"='ALA dehydratase';