Fosfomycin sodium26016-99-9100 % similar Fosfomycin calcium26016-98-877 % similar Fosfomycin23155-02-443 % similar Fosfomycin tromethamine78964-85-932 % similar Sodium phosphate (na6P6O18)10124-56-831 % similar Tetrasodium pyrophosphate7722-88-531 % similar Sodium trimetaphosphate7785-84-431 % similar