Asymmetric dioxazine compounds and method for dyeing or printing fiber materials using the same

An asymmetric dioxazine compound represented by the following formula (I) in the free acid form:

• wherein A.sub.1 and A.sub.2 independently of one another are each sulfo, halo, alkyl or alkoxy, X.sub.1 and X.sub.2 independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R.sub.1 is hydrogen or unsubstituted or substituted alkyl, R.sub.2 and R.sub.3 independently of one another are each hydrogen, alkyl, alkoxy, halo or amino which is unsubstituted or substituted once or twice by C.sub.1 -C.sub.4 alkyl, Z is a fiber-reactive group selected from aromatic fiber reactive groups having at least one fiber reactive substituent on a 5- or 6-membered aromatic heterocyclic ring or a poly-condensed aromatic system, aliphatic fiber reactive groups and fiber reactive groups formed by combination of an aromatic fiber reactive group and an aliphatic fiber reactive group which are connected by a suitable bridging group, m and n independent of one another are each 0 or 1, provided that m.noteq.n, and L is 1 or 2.