They can be preceded by a multiplying prefix such as bi, bis, di, hemi, hepta, hexa, mono, penta, sesqui, tetra, tri, tris… (e.g. diacetate).
De kan have et multiplicerende præfiks som f.eks. bi, bis, di, hemi, hepta, hexa, mono, penta, sesqui, tetra, tri, tris… (f.eks. diacetat).