... 1575 /. Heterocyclic Chem., 26, 1575 (1989). ... REFERENCES AND NOTES [1] Aldrich Chemical Company. [2a] RH Meen, WH Moore and JB Dickey, US Patent 3,143,540 (1964); [b] H. Schulz, F. Arndt, G.-A. Hoyer and R. Rusch, US Patent 3,454,591 (1969); [c] J. Deli and H. С ...