M 1770 (OTTO) Merrifiels resin, 1% crossilinked, 200-400 mesh Cas 55844-94-5 - used in Solid-phase synthesis. M 1770 (OTTO) Merrifiels resin, 1% crossilinked, 200-400 mesh Cas 55844-94-5 - used in the Merrifield Synthesis of polypeptide chains, facilitated by DCC.