▁neutral ity ▁of ▁the ▁material . ▁ ▁As ▁such , ▁ 2 , 6 - d ih ydro anth ra quin one ▁can ▁be ▁used ▁as ▁a ▁negative ▁electro ly te ▁res er voir ▁in ▁an ▁al kal ine ▁flow ▁battery ▁( opp os ite ▁ferro cy an ide ) ▁to ▁store ▁electrons ▁when ▁a ▁current ▁is ▁applied ▁at ▁an ▁ion - select ive ▁memb rane . ▁ ▁Anth ra quin ones ▁are ▁also ▁used ▁as ▁la x atives ▁such ▁as ▁in ▁the ▁drug ▁sen na ▁g ly cos ide . ▁ ▁References ▁▁ ▁Category : An th ra quin ones ▁ ▁it : Ant rach in oni <0x0A> </s> ▁Martin ▁Pra ger ▁May er ▁( J anu ary ▁ 1 4 , ▁ 1 9 2 8 ▁– ▁August ▁ 1 , ▁ 2 0 1 9 ) ▁was ▁the ▁writer ▁of ▁ 3 5 ▁non - f iction ▁books , ▁including ▁Mad ison ▁Avenue , ▁U . S . A . ▁( 1 9 5 8 ), ▁The ▁School s ▁( 1 9 6 1 ), ▁The ▁Law y ers ▁( 1 9 6 7 ), ▁About ▁Television ▁( 1 9 7 2 ), ▁The ▁Bank ers ▁( 1 9 7 5 ), ▁The ▁Build ers ▁( 1 9 7 8 ), ▁Ris ky ▁Business : ▁The ▁Col lapse ▁of ▁Lloyd ' s ▁of ▁London ▁( 1 9 9 5 ), ▁The ▁Bank ers : ▁The ▁Next ▁Generation ▁( 1 9 9 7 ), ▁The ▁Fed ▁( 2 0 0 1