Postgresql Insert into server from local using dblink - postgresql

I am connecting postgres in 192.168.4.12 I want to insert into table in server IP 192.168.4.13, I have tried but I get error.
ERROR: syntax error at end of input
CONTEXT: Error occurred on dblink connection named "unnamed": could not execute command.
********** Error **********
ERROR: syntax error at end of input
SQL state: 42601
Context: Error occurred on dblink connection named "unnamed": could not execute command.
Here is the syntax.
SELECT dblink_exec
('hostaddr=192.168.4.13 dbname=mrp-pti-coba user=postgres password=passwordb',
'insert into mst_item(item_id) values
(dblink_exec("hostaddr=192.168.4.12 dbname=mrp-exp2 user=postgres password=passworda","select item_id from mst_item")');

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The code below is what I tried and I get this error message:
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https://www.ibm.com/docs/en/db2-for-zos/12?topic=sf-hash-crc32-hash-md5-hash-sha1-hash-sha256

You appear to be using Db2-v11 for Z/OS "DSN11015" in V11 compatibility mode.
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At Version-11 , IBM documents a function ENCRYPT_TDES which may help you.
Background information on using this function.
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