2-ethyl-1,1,4-trioxo-1,2,3,4-tetrahydro-1λ6-naphtho[2,1-e][1,2]thiazine-3-carboxylic acid methyl ester 、
2-氨基噻唑 以
邻二甲苯 为溶剂,
以yielding 1.0 gm (25% of theory) or 2-ethyl-4-hydroxy-N-(2-thiazolyl)-2H-naphtho[2,1-e]-1,2-thiazine-3-carboxamide-1,1-dioxide, m.p. 261°-262° C (decomp.)的产率得到2-ethyl-1,1,4-trioxo-1,2,3,4-tetrahydro-1λ
6-naphtho[2,1-
e][1,2]thiazine-3-carboxylic acid thiazol-2-ylamide