import json

veri = '{"murl":"https://images-na.ssl-images-amazon.com/images/I/61QtugLhCsL._AC_UL1000_.jpg","mid":"5E4B55BBDB1984AA2FE6206C41CADD86616456CB","purl":"https://www.amazon.co.uk/RtOnbra-Freaking-Womens-Casual-Sleeve/dp/B07ZYVKDK9"}'

url = json.loads(veri)['murl']