How to get or calculate inputs's prev_out tx hash using script ?

i am looking at tx json output at blockchain.info

here is simple tx for ref. using 1 input and 1 output.

https://blockchain.info/tx/727b2cd08e728aeb08580333207c52d0ddf3ba47f85bd59241c3d92436f5fdd5

Code:

{
   "ver":2,
   "inputs":[
      {
         "sequence":4294967295,
         "witness":"",
         "prev_out":{
            "spent":true,
            "tx_index":188897912,
            "type":0,
            "addr":"3KeMARg9fppMVGytgyVJpc37oAXWyRbRuv",
            "value":272135,
            "n":0,
            "script":"a914c4f11390a7b4fcb4ffc4bd7e756596c706d6098887"
         },
         "script":"00483045022100af349f6a1d70f7d179559ea054cbd7869537f303915e2368b29a51041307562b022025b849a291dbaccfeafdb7e6678f586793c365a38d0c1685410b875e0f541611014730440220210616dd589181b0194ab73f0b7a6aac15c5b17c9c80621397bafbf0060ef56a0220247e5bca72de61be853027bcb2cfa3ceff1912e7019e7fa8573665fc559eb998014c69522102def45a0229881116d6000bc99921426c35a3a8bb92e1d4485679a23c93799f512102ef970eabc8e92f7dc357a93ded039e63137718df0bcd19b3e74f7f1a9ad870e621037d811aa90fcb399985f79699f4e92044b663e01456f22bbc50888eccaffb742f53ae"
      }
   ],
   "weight":1360,
   "relayed_by":"0.0.0.0",
   "out":[
      {
         "spent":false,
         "tx_index":286831175,
         "type":0,
         "addr":"1NjTJADyoBLpqvM6kbc9VSMS9DnqUhMZ7R",
         "value":236548,
         "n":0,
         "script":"76a914ee6210015c3768052078a9802b5a648b7991bfb188ac"
      }
   ],
   "lock_time":0,
   "size":340,
   "double_spend":false,
   "time":1506651576,
   "tx_index":286831175,
   "vin_sz":1,
   "hash":"727b2cd08e728aeb08580333207c52d0ddf3ba47f85bd59241c3d92436f5fdd5",
   "vout_sz":1
}

how can i get/calculate input's tx_hash. i mean prev_out input's tx hash. from the available info in current json ?
i.e. from this

Code:

      {
         "sequence":4294967295,
         "witness":"",
         "prev_out":{
            "spent":true,
            "tx_index":188897912,
            "type":0,
            "addr":"3KeMARg9fppMVGytgyVJpc37oAXWyRbRuv",
            "value":272135,
            "n":0,
            "script":"a914c4f11390a7b4fcb4ffc4bd7e756596c706d6098887"
         },
         "script":"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"
      }

i want to get this

Code:

626ce1cc231f67c6895d92ee28aa4a595e86ffc7ba22de0d5a4469178ee84719