ProductsAntibioticsButyrolactone I Butyrolactone I SKU: B057-1MG Unit: Each Brand: TOKU-E Butyrolactone I Other products from «Antibiotics» Geninthiocin # G052-0.5MG Mithramycin A # M063-5MG 5-Methoxycanthinone # M111-1MG Vitamin B12 Usp # V004-1G