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Based on limited metadata, the FDA issued a warning letter to Yicheng Chemical Corp. on January 1, 2018, regarding an "Other" product category, though the specific product type and regulatory violations are not detailed in the available information. Without access to the full warning letter text or subject line details, the precise nature of the compliance issues cannot be determined. The issuing FDA office is also not identified in the metadata provided. To understand the specific regulatory concerns and required corrective actions, the complete warning letter would need to be reviewed.