37270-69-2 Benserazide combination with Levodopa L-Tyrosine, 3-hydroxy-, mixt. with DL-serine 2-((2,3,4-trihydroxyphenyl)methyl)hydrazide Madopa Modopar Ro 8-0576 Ro 8-0576-12 Ro 8-0576-7 madopar