... REFERENCES AND NOTES [1] J. Sam and JL Valentine, /. Pharm. ... [2] JW Cornforth, Renzoxazoles and Related Systems, Heterocyclic Chemistry, Vol 5, R. С Elderfield, ed, John Wiley and Sons, New York, NY, 1957, p418. ... Heterocyclic Chem., 19, 1545 (1982). ...