Arsenate(2-), bis[.mu.-(2,3-dihydroxy butanedioato(4-)-O(1),O(2):-O(3),O(4))]di-, stereoisomer, dihydrogen, compd. with 3-aminophenol (1:2) Arsenate(2-), bis[.mu.-[2,3-dihydroxybutanedioato(4-)-O1,O2:O3,O4]]di-, stereoisomer, dihydrogen, compd. with 3-aminophenol (1:2) BIS[.MU.-(2,3-DIHYDROXYBUTANEDIOATO(4-)-O1,O2:O3,O4)]DIARSENATE(2-) STEREOISOMER, DIHYDROGEN CMPD WITH 3-AMINOPHENOL (1:2) NSC31661