US transport plane downed over Poland after 8/05/45

[ironrat]

I heard a few times o story of a US plany transport? bomber? carrying penicillin shippment, downed after in 1945 but after 8/05/1945 over central Poland by russian fighter/fighters. Latelly, I was shown by an eye witness of the crash the remains of a radio transmitter coming from? that plane . A few days after the crash, a lot of penicillin apeared on the local black market. The rest of it was transported under heavy military escort to Warsaw. The two facts above were confirmed by withnesses. If penicillin survived the crash, the crew probably did too.
I don't know the exact date of the events nor the type of the plane. I just know with certitude, that the events took place in 1945.
Where to look for further information? Any MACR issued?

Ironrat