The term methylene group is identified in base64 scheme by the sequence bWV0aHlsZW5lIGdyb3Vw, while the MD5 signature is equal to f1e1345794fc4ef6d0a9fab9e3fd2a83. The ASCII encoding of methylene group in hexadecimal notation is 6d657468796c656e652067726f7570.