87-32-1 DL-Acetyltryptophan DL-N-Acetyltryptophan DL-Tryptophan, N-acetyl- N-Acetyl-DL-tryptophan N-Acetyl-DL-tryptophane NSC49124 Tryptophan, N-acetyl-, DL- d,l-.alpha.-Acetylamino-3-indolepropionic acid