1 carcinoma,'rhahdom?-osarcoma." other experimental systems.'and man." This drug acts as a nonspecific stimulant of the immune system." Levamisole and its analogues are inhibitors of alkaline phosphatase. 6 X fused benzimidazolylthiaz~) leacetic acid derivative 2 and a py- rimidylthiazoleacetic acid derivative 3 were also known to he artive against Lewis lung tumor.'Recently, a ureidothiazole derivative 4 (Carl~ olahs, 1nc. I
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