The present invention relates to novel xanthene and thioxanthene derivatives of the following general formula: ##STR1## wherein Y represents sulfur or oxygen, R.sup.1 represents hydrogen, chlorine, trifluoromethyl or dimethylsulfamoyl, R.sup.2 represents hydrogen or fluorine; and R.sup.3 and R.sup.4 each represents hydrogen or methyl, provided that R.sup.3 and R.sup.4 may not both represent hydrogen, or R.sup.3 and R.sup.4 taken together with the nitrogen atom form a piperazine or piperidine ring optionally substituted in the 4-position by a methyl group or a 2-hydroxyethyl group, if desired, esterified with an aliphatic carboxylic acid having from one to seventeen carbon atoms inclusive, as well as non-toxic acid addition salts thereof.
本发明涉及以下一般式的新型黄色素和
硫代黄色素衍
生物:##STR1## 其中Y代表
硫或氧,R.sup.1代表氢,
氯,三
氟甲基或二甲基磺酰基,R.sup.2代表氢或
氟;R.sup.3和R.sup.4分别代表氢或甲基,但前提是R.sup.3和R.sup.4不能同时代表氢,或者R.sup.3和R.sup.4与氮原子一起形成一个
哌嗪或
哌啶环,在4-位置上可以选择性地用甲基基团或2-羟乙基基团进行取代,如果需要,则酯化为具有从1到17个碳原子的脂肪族
羧酸的非毒性酸加成盐。