Get Master Private Key from BIP39 Seed

Get Master Private Key from BIP39 Seed

I have BIP39 Seed:

5b56c417303faa3fcba7e57400e120a0ca83ec5a4fc9ffba757fbe63fbd77a89a1a3be4c67196f57c39a88b76373733891bfaba16ed27a813ceed498804c0570

I want to get Master private Key

Then I Have to use HMAC-SHA512, I can use this site, which secret I have to add ? I don't have any secret, for test I choose "mnemonic", the same constant that I use to generate BIP39seed (is it correct? )

the result is:

9744d0d7e168f725b6cc36a73c24dfc91bd6d80bf5a6871ad2c6c0b854e4e281b74049c41d25f0b338b3fc9b053b87b95636c3c94c31f37458fe98a09a4a94c9

and I can get

left 256 bits  => 9744d0d7e168f725b6cc36a73c24dfc91bd6d80bf5a6871ad2c6c0b854e4e281
right 256 bits  => b74049c41d25f0b338b3fc9b053b87b95636c3c94c31f37458fe98a09a4a94c9

And I can Get master private key in this way?

PKM = bx ec-to-wif 9744d0d7e168f725b6cc36a73c24dfc91bd6d80bf5a6871ad2c6c0b854e4e281

result: L2Hku6wzwvWnHAct8TmtfvviE4QXBTXtZrae2buXwjq5mRG4doF2

but this result is not in https://iancoleman.io/bip39/ If I import my mnemonic phrase

(army van defense carry jealous true garbage claim echo media make crunch)

http://bit.ly/2Uwsm5N

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