What is the meaning of "V" in Compound Amino Acid Injection (18AA-V)?

"18AA-V" manufacturers are: Compound Amino Acid Injection (18AA-V) 100ml: 3.224g (total amino acids) + 5g (xylitol) Fuzhou Haiwang Fu Pharmaceutical Co. Ltd. Compound Amino Acid Injection (18AA-V) 500ml:16.12g(Total Amino Acid) +25g(Xylitol)Fuzhou Haiwang Fu Medicine Pharmaceutical Co. Haiwang Fu Medicine Pharmaceutical Co., Ltd. (Mu'an) Hubei Province, Yichang Branch of the Bafeng Pharmaceutical and Chemical Co., Ltd. (life) Hubei a half-day Pharmaceutical Co.