Greek PM Alexis said on Wednesday some of the international lenders have not accepted the latest package of reform proposals to which unlocking aid for the country is tied.“The insistence of certain institutions of not accepting parametric measures has never happened before -- not in Ireland, nor in Portugal,” he wrote on Twitter prior to his meeting with creditors in Brussels. The repeated rejection of equivalent measures by certain institutions never occurred before-neither in Ireland nor Portugal. #Greece (1/2) — Alexis Tsipras (@tsipras_eu) June 24, 2015 This odd stance seems to indicate that either there is no interest in an agreement or that special interests are being backed. #Greece (2/2) — Alexis Tsipras (@tsipras_eu) June 24, 2015 Wednesday's effort is considered to be a last-ditch attempt to agree on a new deal about Greece's bailout and to disburse billions in EUR that Athens will use to deliver on loan installments by June 30 and avoid default. After a months-long deadlock between Tsipras' leftist government and international lenders, Greece on Monday submitted a reforms package which basically includes measures previously required by lenders (the European Union, the European Central bank, and the International Monetary Fund).Changes to the pensions system and taxation are at the core of wrangling between Greece and the international bodies.Another emergency Eurogroup meeting is ude after Tsipras' talks with the heads of the three organizations.