Ergometrine is the INN (WHO),here some Spezifications:
Ergometrine is an amine ergot alkaloid. The molecular formula of ergometrine maleate, designated chemically as 9,10-didehydro- N -[( S )-2-hydroxy-1-methylethyl]-6-methylergoline-8-carboxamide hydrogen maleate is C19H23N3O2,C4H4O4. Its molecular weight is 441.5. The CAS registry numbers of ergometrine and ergometrine maleate are 60-79-7 and 129-51-1 respectively.