Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Tie no | Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
| --- | --- | --- | --- | --- | --- |
| 1.0 | Borac Banja Luka | 2–1 | Osijek | 2–0 | 0–1 |
| 2.0 | Budućnost Titograd | 2–1 | Partizan | 2–0 | 0–1 |
| 3.0 | Dinamo Zagreb | 5–1 | Sarajevo | 1–0 | 4–1 |
| 4.0 | Hajduk Split | 3–3 ( a ) | Pelister Bitola | 1–1 | 2–2 |
| 5.0 | OFK Belgrade | 3–2 | Željezničar Sarajevo | 2–1 | 1–1 |
| 6.0 | Proleter Zrenjanin | 2–0 | Koper | 2–0 | 0–0 |
| 7.0 | Sloboda Tuzla | 3–4 | Rijeka | 2–0 | 1–4 |
Question:
Who is team 1 when team 2 is koper?
Answer:
Proleter Zrenjanin