A novel epimerization system in fungal secondary metabolism involved in the conversion of isopenicillin N into penicillin N in Acremonium chrysogenum

1. Ullán, R.V.
2. Casqueiro, J.
3. Bañuelos, O.
4. Fernández, F.J.
5. Gutiérrez, S.
6. Martín, J.F.