How to Find the file in UNIX?

Hello Team,
I Have below list files and i have to find the file with latest date and time
CHECK_300914_200747_xxaa_account_name_20140930195924.txt
CHECK_300914_203213_xxaa_account_name_20140930203055.txt
CHECK_300914_205625_xxaa_account_name_20140930200219.txt
CHECK_300914_211345_xxaa_account_name_20140930200446.txt
CHECK_300914_213836_xxaa_account_name_20140930200718.txt
CHECK_300914_215928_xxaa_account_name_20140930201143.txt
In a list of files "CHECK_300914_215928_xxaa_account_name_20140930201143.txt" is the latest file i.e. ddmmyy:300914 and hhmmss:215928
Can you please help me to find the file in UNIX
Thanks in Advance,

touch CHECK_300914_215928_xxaa_account_name_20140930201143.txt
touch CHECK_300914_211345_xxaa_account_name_20140930200446.txt
touch CHECK_300914_205625_xxaa_account_name_20140930200219.txt
touch CHECK_300914_203213_xxaa_account_name_20140930203055.txt
touch CHECK_300914_200747_xxaa_account_name_20140930195924.txt
ll
total 0
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:27 CHECK_300914_200747_xxaa_account_name_20140930195924.txt
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:27 CHECK_300914_203213_xxaa_account_name_20140930203055.txt
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:27 CHECK_300914_205625_xxaa_account_name_20140930200219.txt
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:26 CHECK_300914_211345_xxaa_account_name_20140930200446.txt
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:25 CHECK_300914_213836_xxaa_account_name_20140930200718.txt
-rw-r--r-- 1 oracle oinstall 0 Oct 7 11:25 CHECK_300914_215928_xxaa_account_name_20140930201143.txt
We are interesting in file with maximal values in "field" 2 and 3 assuming that fields are parts of filename separated with "_". I especially created (the file we are interested in) CHECK_300914_215928_xxaa_account_name_20140930201143.txt file to be the first created/modified file.
find . -name CHECK_300914_215928_xxaa_account_name_20140930201143.txt
./CHECK_300914_215928_xxaa_account_name_20140930201143.txt
will definitely work. But we should know the file name. As for topicstarter note it is not the case.
ls -tr . | tail -1
CHECK_300914_200747_xxaa_account_name_20140930195924.txt
gave incorrect file.
ls -l . | cut -d" " -f10 | sed 's/$^CHECK_$$[0-9]\{2\}$$[0-9]\{2\}$$[0-9]\{2\}$$.*$/\1\4\3\2\5/' | sort -r | head -1 | sed 's/$^CHECK_$$[0-9]\{2\}$$[0-9]\{2\}$$[0-9]\{2\}$$.*$/\1\4\3\2\5/'
CHECK_300914_215928_xxaa_account_name_20140930201143.txt
P.S.
I much apologize for an error in back filename transformation. Correct is marked in bold red.

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