Table schema:
CREATE TABLE table_name_48 (melamine_content_mg_kg_ INTEGER, producer VARCHAR, samples_failed VARCHAR)

Question: What's the most melamine content that has more than 1 samples failed and produced by Guangzhou Jinding Dairy Products Factory?
SQL: SELECT MAX(melamine_content_mg_kg_) FROM table_name_48 WHERE producer = "guangzhou jinding dairy products factory" AND samples_failed > 1