I'm not 100% on this, but after looking at the structure of mustard oil, the isothiocyanate CH2=CHCH2NCS, I expect that the reaction would be base catalysed hydrolysis.
CH2=CHCH2NCS + 2 H2O ----> CH2=CHCH2NH2 + CO2 + H2S
As for conditions, I'd try refluxing a continuously stirring mixture of mustard oil + aqueous NaOH.
Be aware that I don't know if this is correct, it's just what I think would happen. If you are planning to do this yourself, H2S is very unpleasant.
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