FUSED THIOPHEN-2-OXAMINIC ACID DERIVATIVES

摘要

The invention relates to a process for the preparation of compounds of the formula I in which R1, R2 and R3 have the meaning stated in the description, by introducing the group -COCOOR3 into the corresponding 2-amino compounds. The compounds of the formula I are distinguished by an action resembling that of disodium cromoglicate.