Synonyms: 3,3,3,3-tetrame.-1,1-spirobiindane-5,5,6,6-tetraol; 3,3,3,3-tetramethyl-1,1-spirobisindane-5,5,6,; 3,3,3,3-Tetramethyl-1,1-spirobiindane-5,5,6,6-tetraol; 3,3,3_,3_-Tetramethyl-1,1_-spirobisindane-5.5_,6,6_-tetrol; 2-Chloro-4-Methylthiobutyric acid