33889-68-8 bisbenzylisoquinoline alkaloid Demethyl Tetrandrine pharmaceutical reference standard Stephania tetrandra Demethyl Tetrandrine CAS: 33889-68-8 Visualizza i dettagli
548-04-9 Hypericin pharmaceutical reference standard photodynamic therapy St. John's Wort extract Estratti vegetali Hypericin CAS: 548-04-9 Visualizza i dettagli