Title cpds., which are of the benzpyrane type, are of formula (I): (where m is 1 or 2; n is 0 or 1, B is O, NH or (NX)mZ4, X being CO or SO2 and Z4 being, if m = 1, opt. subst. alkyl, cycloalkyl, aralkyl, aryl or vinyl, or alkoxy, phenoxy or amino, or if m = 2, methylene, ethylene, phenylene or a gp. of formula: Z is opt. substd. alkyl or aralkyl; Z' and Z2 are each H or opt. substd. alkyl, cycloalkyl or aryl; or Z1 and Z2 together with the N atom may form a heterocycle, or satd. ring linked in the o- pos. to the N atom and contg. 5-6 opt. substd. numbers; Z3 is, halogen, alkyl, alkoxy, CN, NO2, opt. substd. carbamoyl or sulphamoyl, or carbalkoxy; Z5 is H, carbalkoxy, NO2, CN, alkanelsulphonyl, opt. substd. carbamoyl or sulphanoyl, or phenyl, arenesulphonyl, benzionidazolyl, being thiazolyl or quinazolinyl; Z6 is H or Me; A encircled negative is an anion).
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