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9-(propene-3-ylidene-1), and 9-3'-(nu-hydrox-yalkylpiperazino-nu)-propylidene, xanthenes and thiaxanthenes, and processes for their preparation
9-(propene-3-ylidene-1), and 9-3'-(nu-hydrox-yalkylpiperazino-nu)-propylidene, xanthenes and thiaxanthenes, and processes for their preparation