betulin molecule, molecular structures, c30h50o2 3d model, structural chemical formula and atoms with color coding

betulin molecule molecular structure chemical formula model c30h50o2 atom chemistry bark birch tree oncology cancer composition silver drawing skeletal compound protein icon line alder flat science element antitumoral betuline bullosa elementbinding epidermolysis regulatory srebp sterol triterpene conceptual reaction scientific ball substance nature elemental grey herbal plastic alternative medicine structures structural atoms color coding coding