The term aldehyde group is identified in base64 scheme by the sequence YWxkZWh5ZGUgZ3JvdXA=, while the MD5 signature is equal to c2c6b8dc5e3786eab2ac1c01acf611d5. The ASCII encoding of aldehyde group in hexadecimal notation is 616c6465687964652067726f7570.