I am sorry, I did not understand. you mean that the correct syntax should be:
https://scihub.copernicus.eu/dhus/odata/v1/Products(‘81acec7c-3020-408b-8125-9193b3975b28’)/Nodes(‘S2A_OPER_PRD_MSIL1C_PDMC_20160128T032144_R094_V20160125T111611_20160125T111611.SAFE’)/Nodes(‘GRANULE’)/Nodes(‘S2A_OPER_MSI_L1C_TL_SGS__20160125T164509_A003094_T30SWF_N02.01’)/Nodes()