| 摘要 |
Oxa- or thia-aliphatically bridged quinoxaline-2,3-dione derivs. of formula (I) and their salts, are new. A1 = lower alkylidene or CHA4R4; A2 = lower alkylidene CHA4R4, CO or CH(OH)A5R4; A3 = oxy, opt. oxidised thio or CO; A4 = lower alkylene; A5 = lower alkylene or a bond; n = 0-1; R1 and R2 = H, opt. lower alkyl- and/or lower alkanoyl-substd. amino, NO2, lower alkanoyl, opt. esterified or etherified OH, opt. esterified or amidated carboxy, CN, opt. halogenated lower alkyl or halo; R3 = H or OH; R4 = H, CN, opt. esterified or amidated carboxy opt. esterified phosphono or 5-tetrazolyl. |
