2.5.1.57 N-acylneuraminate-9-phosphate synthase; N-acetylneuraminate 9-phosphate lyase; N-acetylneuraminate 9-phosphate sialic acid 9-phosphate synthase; N-acetylneuraminate 9-phosphate synthetase; N-acylneuraminate-9-phosphate pyruvate-lyase (pyruvate-phosp • • •